A SysOps administrator needs to develop a solution that provides email notification and inserts a record into a database every time a file is put into an Amazon S3 bucket.
What is the MOST operationally efficient solution that meets these requirements?
The most operationally efficient solution is to set up an S3 event notification that targets an Amazon Simple Notification Service (Amazon SNS) topic. This allows for a single notification mechanism from which multiple actions can be triggered. By creating two subscriptions for the SNS topic, one can efficiently send the email notification while the other invokes an AWS Lambda function to insert the record into the database. This method effectively separates the two processes while maintaining simplicity and operational efficiency.
https://aws.amazon.com/pt/premiumsupport/knowledge-center/lambda-subscribe-sns-topic-same-account/
S3 itself support SNS
You can't set up two S3 event notifications with the same Event types. But it's possible configure Lambda function, without SNS, in S3 event notifications
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A only
A and D can be correct answer. IMO the term "Operationally Efficient" is a bit confusing in this scenario. I would go for A to manage one single notification from the source into a fan out strategy where I can handle the exception in SNS.
Please cancel this comment, I misread the D option. Is A for sure.