You have created two AWS CloudFormation stacks in the AWS region us-east-1. Stack A has exported the resource output for a security group. Stack B uses the Fn::ImportValue intrinsic function to import the exported value in its template. Both stacks are in the CREATE_COMPLETE status. Now you would need to perform some actions on these stacks. Which of the following actions can you perform successfully?

Answer options:

A.Delete stack A using AWS console as the created resources in stack A are no longer needed in the region.
B.In stack A, update the resource output value as the security group needs to change its name.
C.Update stack A to remove the resource output that is referenced by stack
B.D.Update stack B to remove the cross-stack reference so that stack B does not import the resource output from stack A.

Correct Answer: D
Option A is incorrect because there are some limitations if there is a cross-stack reference between two CloudFormation stacks. Stack A cannot be deleted as it has a resource output that is referenced by stack
B.Option B is incorrect because you cannot modify the output value that is referenced by another stack. This operation will fail.
Option C is incorrect because this is similar as Option
B. You cannot remove the output value that is referenced by another stack.
Option D is CORRECT because you can update stack B to remove the cross-stack reference. This operation is allowed.
Reference:
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/walkthrough-crossstackref.html