Your team has created a new AWS CodeDeploy application to automate deployments to Amazon EC2 instances under an autoscaling group. It is possible that a deployment activity has failed due to software issues. Your manager asked you to configure automatic rollback for the deployment group in the production environment. In terms of the automatic rollback configuration of CodeDeploy, which statement is correct?

Answer options:

A.Users can configure SNS notifications for deployment activities. Rollback can be triggered whenever SNS topics receive notifications.
B.There is no automatic rollback for CodeDeploy deployment group. However, users can trigger rollback manually.
C.Automatic rollback can only be configured for EC2 instances. On-premises instances do not have this feature.
D.Automatic rollback can be triggered when alarm thresholds are met.

Correct Answer – D
Check https://docs.aws.amazon.com/codedeploy/latest/userguide/deployments-rollback-and-redeploy.html
for how to redeploy and roll back a deployment in CodeDeploy.
Option A is incorrect: Users can configure triggers using SNS notifications. However, automatic rollback cannot be configured together with these triggers.
Option B is incorrect: CodeDeploy deployment group supports automatic rollback. It is within the advanced settings. Check the above link.
Option C is incorrect: Because EC2 Auto Scaling groups, EC2 instances or On-premises instances all support automatic rollback.
Option D is CORRECT: Because automatic rollback can be triggered when a deployment fails or the configured alarm thresholds are met: