AnswerA
The task is to force automatic encryption for every new EBS volume and prevent possibility of creation any unencrypted volume hence:
https://docs.aws.amazon.com/ebs/latest/userguide/work-with-ebs-encr.html#ebs-encryption_key_mgmt
To enable encryption by default for a Region
Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
From the navigation bar, select the Region.
From the navigation pane, select EC2 Dashboard.
In the upper-right corner of the page, choose Account Attributes, Data protection and security.
Choose Manage.
Select Enable. You keep the AWS managed key with the alias alias/aws/ebs created on your behalf as the default encryption key, or choose a symmetric customer managed encryption key.
Choose Update EBS encryption.