How can the user achieve DR?

A user has launched a large EBS backed EC2 instance in the US-East-1a region. The user wants to achieve Disaster Recovery (DR) for that instance by creating another small instance in Europe.

How can the user achieve DR?
A . Copy the instance from the US East region to the EU region
B . Use the “Launch more like this” option to copy the instance from one region to another
C . Copy the running instance using the “Instance Copy” command to the EU region
D . Create an AMI of the instance and copy the AMI to the EU region. Then launch the instance from the EU AMI

Answer: D

Explanation:

To launch an EC2 instance it is required to have an AMI in that region. If the AMI is not available in that region, then create a new AMI or use the copy command to copy the AMI from one region to the other region.

Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/CopyingAMIs.html