The answer is B. The keyword here is that it's an on-demand instance, which is billed by the second: With On-Demand Instances, you pay for compute capacity by the second with no long-term commitments. You pay only for the seconds that your On-Demand Instances are in the running state, with a 60-second minimum https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-on-demand-instances.html Reserved instances get rounded to an hour. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/concepts-reserved-instances-application.html

It is B. "Each partial instance-hour consumed is billed per-second for instances launched in Linux, Windows, or Windows with SQL Enterprise, SQL Standard, or SQL Web instances." https://repost.aws/knowledge-center/ec2-instance-hour-billing "We are excited to announce that Amazon EC2 usage of Linux based instances that are launched in On-Demand, Reserved and Spot form will be billed on one second increments, with a minimum of 60 seconds." https://aws.amazon.com/about-aws/whats-new/2017/10/announcing-amazon-ec2-per-second-billing/#:~:text=We%20are%20excited%20to%20announce%20that%20Amazon%20EC2,second%20billing%20with%20a%20minimum%20of%2060%20seconds

C. 3 hours, 6 minutes Amazon EC2 instances are billed for their running time, rounded up to the next full minute. So if an instance runs for any part of a minute, you will be billed for the full minute. In this case, the instance ran for 3 hours, 5 minutes, and 6 seconds, so the customer will be billed for 3 hours and 6 minutes.

Given that Amazon charges a minimum of 60 seconds and then charges the exact time of use, we can calculate the billing accordingly. The customer ran the Amazon EC2 instance for 3 hours, 5 minutes, and 6 seconds. The billing would be rounded up to the nearest 60-second increment for the first 60 seconds, and then billed for the exact time of use beyond that. So, the customer would be billed for 3 hours and 6 minutes, as the 6 seconds would be rounded up to 1 minute. Therefore, the correct answer remains: C. 3 hours, 6 minutes.

Round up to the nearest hour, so 4 hours

The billing for Amazon EC2 instances is done on an hourly basis, with partial hours rounded up to the nearest hour. Therefore, if a customer runs an On-Demand Amazon Linux EC2 instance for 3 hours, 5 minutes, and 6 seconds, they will be billed for 4 hours

Announcing Amazon EC2 per second billing Posted On: Oct 2, 2017 We are excited to announce that Amazon EC2 usage of Linux based instances that are launched in On-Demand, Reserved and Spot form will be billed on one second increments, with a minimum of 60 seconds. Amazon EC2 Elastic GPUs and Amazon EBS volumes will also move from per hour billing to per second billing with a minimum of 60 seconds. As with EC2 instances, the list prices will continue to be displayed as it is today in GB-month for capacity, IOPS-month provisioned for io1 IOPS and per Million I/O requests for Magnetic IOPS. https://aws.amazon.com/about-aws/whats-new/2017/10/announcing-amazon-ec2-per-second-billing/#:~:text=We%20are%20excited%20to%20announce%20that%20Amazon%20EC2,second%20billing%20with%20a%20minimum%20of%2060%20seconds

he customer will be billed for 4 hours of usage for their On-Demand Amazon Linux EC2 instance. Here's why: Amazon EC2 bills for instance usage in one-hour increments, with a minimum charge of one hour even if the instance runs for less than that. In this case, the instance ran for 3 hours, 5 minutes, and 6 seconds, which translates to: 3 hours (exact) 5 minutes (less than 60 minutes, so not counted) 6 seconds (less than 60 seconds, so not counted) Since any partial hour is rounded up to the nearest full hour for billing purposes, the customer will be charged for 3 full hours + 1 additional hour for the remaining 6 seconds, totaling 4 hours of usage.

EC2 On-Demand Instances works on a per-second basis with a minimum of 60 seconds. Once the first 60 seconds have elapsed, AWS begins billing in seconds. However, if any part of a minute is used beyond the first 60 seconds, AWS rounds up to the next full minute. Therefore, in this case, the usage of 6 seconds beyond the 5 minutes will result in being billed for an extra full minute, making the total billing time 3 hours and 6 minutes.

EC2 usage is billed in one-second increments, with a minimum of 60 seconds.

The customer was running the EC2 instance for 3 hours, 5 minutes, and 6 seconds. Amazon bills for EC2 instances in one-second increments, so the customer will be billed for the full duration of 3 hours, 5 minutes, and 6 seconds. Option A (3 hours, 5 minutes) is incorrect because it does not include the 6 seconds. Option C (3 hours, 6 minutes) is incorrect because it rounds up the minutes incorrectly. Option D (4 hours) is incorrect because it rounds up the time too much.

The correct answer is: C. 3 hours, 6 minutes Explanation: Amazon EC2 is billed on an hourly basis, but it uses per-second billing with a minimum of 60 seconds. If an instance runs for any part of a minute, you are billed for that full minute. So, if an instance runs for 3 hours, 5 minutes, and 6 seconds, you will be billed for 3 hours and 6 minutes.

This is from the AWS documentation for On-Demand instance pricing Pricing is per instance-hour consumed for each instance, from the time an instance is launched until it is terminated or stopped. Each partial instance-hour consumed will be billed per-second for Linux, Windows, Windows with SQL Enterprise, Windows with SQL Standard, and Windows with SQL Web Instances, and as a full hour for all other instance types. https://aws.amazon.com/ec2/pricing/on-demand/ Since OS is Amazon Linux, billing is per second (granularity of billing is at the seconds level, whereas prices are mentioned per hour)

Given that Amazon charges a minimum of 60 seconds and then charges the exact time of use, we can calculate the billing accordingly. The customer ran the Amazon EC2 instance for 3 hours, 5 minutes, and 6 seconds. The billing would be rounded up to the nearest 60-second increment for the first 60 seconds, and then billed for the exact time of use beyond that. So, the customer would be billed for 3 hours and 6 minutes, as the 6 seconds would be rounded up to 1 minute. Therefore, the correct answer remains: C. 3 hours, 6 minutes.

"On-Demand Instances let you pay for compute capacity by the hour or second (minimum of 60 seconds) with no long-term commitments. This frees you from the costs and complexities of planning, purchasing, and maintaining hardware and transforms what are commonly large fixed costs into much smaller variable costs."

Answer is b: EC2 per second bill and minimum 60 second. https://aws.amazon.com/about-aws/whats-new/2017/10/announcing-amazon-ec2-per-second-billing/

The billing for Amazon EC2 instances is done on an hourly basis, with partial hours rounded up to the nearest hour. Therefore, if a customer runs an On-Demand Amazon Linux EC2 instance for 3 hours, 5 minutes, and 6 seconds, they will be billed for 4 hours