How should the Administrator ensure that the AWS CloudFormation template is working in every region?

A SysOps Administrator is troubleshooting an AWS CloudFormation 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:

AMI [ami-12345678] does not exist.

How should the Administrator ensure that the AWS CloudFormation 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 I
C . Edit the AWS CloudFormation template to specify the region code as part of the fully qualified AMI I
E . Edit the AWS CloudFormation template to offer a drop-down list of all AMIs to the user by using the AWS: :EC2: :AMI: :ImageID control.
F . 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 I

Answer: D