How should the administrator ensure that the AWS Cloud Formation template is working in every region?

A SysOps administrator Is troubleshooting an AWS Cloud Formation template whereby multiple Amazon EC2 instances are being created.

The template is working In us-east-1. but it is failing In us-west-2 with the error code:

How should the administrator ensure that the AWS Cloud Formation template is working in every region?
A . Copy the source region’s Amazon Machine Image (AMI) to the destination region and assign it the same ID.
B. Edit the AWS CloudFormatton template to specify the region code as part of the fully qualified AMI ID.
C. Edit the AWS CloudFormatton template to offer a drop-down list of all AMIs to the user by using the aws :: EC2:: ami :: imageiD control.
D. Modify the AWS CloudFormation template by including the AMI IDs in the "Mappings" section. Refer to the proper mapping within the template for the proper AMI ID.

View Answer

Answer: A