A Company Has a Legacy Application Running on AWS

Multiple Choice

A company has a legacy application running on AWS. The application can only run on one Amazon EC2 instance at a time. Application metadata is stored in Amazon S3 and must be retrieved if the instance is restarted. The instance should be automatically restarted or relaunched if performance degrades. Which solution will satisfy these requirements?

A) Create an Amazon CloudWatch alarm to monitor the EC2 instance. When the StatusCheckFailed system alarm is triggered, use the recover action to stop and start the instance. Use a trigger in Amazon S3 to push the metadata to the instance when it is back up and running.
B) Use the auto healing feature in AWS OpsWorks to stop and start the EC2 instance. Use a lifecycle event in OpsWorks to pull the data from Amazon S3 and update it on the instance.
C) Use the Auto Recovery feature in Amazon EC2 to automatically stop and start the EC2 instance in case of a failure. Use a trigger in Amazon S3 to push the metadata to the instance when it is back up and running.
D) Use AWS CloudFormation to create an EC2 instance that includes the user-data property for the EC2 resource. Add a command in user-data to retrieve the application metadata from Amazon S3.