You have an EC2 Instance that is located in a subnet mapped to an Availability Zone. Due to a recent network redesign by your network architects, the Instance needs to be moved to another availability zone ( in another region ). How can you achieve this?

Answer options:

A.Create an AMI out of the EC2 Instance. Copy the AMI and launch a new Instance in the other Availability Zone.
B.Create an ENI in the new subnet. Attach it to the Instance.
C.Assign a new private IP address that pertains to the new subnet and then assign it to the Instance.
D.Assign a new public IP address that pertains to the new subnet and then assign it to the Instance.

Answer – A
This is also given in the AWS Documentation.
How do I move my EC2 instance to another Availability Zone?
Issue
I want to move or copy my EC2 instance to another Availability Zone. How do I do that?
Short Description
To move an EC2 instance, create a new Amazon Machine Image (AMI) in the desired target Availability Zone, launch a new instance based on this image, and then reassign the Elastic IP address from the instance you are moving to the new image.
All other options automatically become invalid because of this restriction.
For more information on moving EC2 Instances, one can visit the below URL
https://aws.amazon.com/premiumsupport/knowledge-center/move-ec2-instance/