Your company has a set of EC2 Instances hosted in AWS. It is mandatory to prepare for regional disasters and come up with the necessary disaster recovery procedures. What would help to mitigate the effects of a disaster for the EC2 Instances?

Answer options:

A.Place an ELB in front of the EC2 Instances.
B.Use Auto Scaling to ensure that the minimum number of instances are always running.
C.Use CloudFront in front of the EC2 Instances.
D.Create AMIs from the EC2 Instances. Use them to recreate the EC2 Instances in another region.

Correct Answer – D
You can create an AMI from the EC2 Instances and then copy them to another region. In case of a disaster, an EC2 Instance can be created from the AMI.
Options A and B are good for fault tolerance. But they cannot help completely in disaster recovery for the EC2 Instances.
Option C is incorrect because we cannot determine if CloudFront would be helpful in this scenario or not without knowing what is hosted on the EC2 Instance.
For disaster recovery, we have to make sure that we can launch instances in another region when required. 
For more information on AWS AMIs, please visit the following URL:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AMIs.html