One of the instances recently appeared with impaired status. You had to manually recover the instance to ensure that it goes back to its original status. What can you do to automate so that it can recover automatically from an impaired state in the future?

Answer options:

A.Check the CloudTrail logs and add an alarm action to recover the Instance.
B.Create a CloudWatch alarm and based on the alarm create an action to recover the Instance.
C.Create an AWS Config rule that triggers an alarm action to recover the instance.
D.Create an AWS Trusted Advisor rule that triggers an alarm and based on that alarm create an action to recover the instance.

Correct Answer: B
You can create an Amazon CloudWatch alarm that monitors an Amazon EC2 instance. If the instance becomes impaired due to an underlying hardware failure or a problem that requires AWS involvement to repair, you can automatically recover the instance. Terminated instances cannot be recovered. A recovered instance is identical to the original instance, including the instance ID, private IP addresses, Elastic IP addresses, and all instance metadata.
Option A is incorrect since this is used to monitor API activity.
Option C is incorrect since this is used to check for configuration changes.
Option D is incorrect since this is used to check for recommendations.
For more information on using Alarm actions, please refer to the below URL-
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UsingAlarmActions.html