You have been assigned to a project to solve a resource drift problem. You have to recover a stack from not being able to reach a normal state. What statement better describes how to proceed in this scenario?

Answer options:

A.When an AWS CloudFormation stack goes into the UPDATE_ROLLBACK_FAILED state you can try to make underlying account changes outside the scope of the stack to re-synchronize the stack with the expectation and then perform a ContinueUpdateRollback action with the ResourcesToSkip request parameter to let AWS CloudFormation set the status of the specified resources to UPDATE_COMPLETE and continue to roll back the stack. Also, if when trying to delete the stack a DELETE_FAILED state is reached, you can perform a DeleteStack action with the RetainResources request parameter to delete the stack while retaining resources failed to delete.
B.Protect the stack from being deleted via UpdateTerminationProtection action. Then perform a ContinueUpdateRollback action with the ResourcesToSkip request parameter to let AWS CloudFormation set the status of the specified resources to UPDATE_COMPLETE and continue to roll back the stack. A DeleteStack action with the RetainResources request parameter is no longer necessary.
C.When an AWS CloudFormation stack goes into the UPDATE_ROLLBACK_FAILED state, you can try to make underlying account changes outside the scope of the stack to re-synchronize the stack with the expectation and then perform a ContinueUpdateRollback action with the ResourcesToSkip request parameter to let AWS CloudFormation set the status of the specified resources to UPDATE_COMPLETE and continue to roll back the stack. Protect the stack from being deleted via UpdateTerminationProtection action. A DeleteStack action with the RetainResources request parameter is no longer necessary.
D.Protect the stack from being deleted via UpdateTerminationProtection action. Then perform a ContinueUpdateRollback action with the ResourcesToSkip request parameter to let AWS CloudFormation set the status of the specified resources to UPDATE_COMPLETE and continue to roll back the stack. Also, if when trying to delete the stack a DELETE_FAILED state is reached, you can perform a DeleteStack action with the RetainResources request parameter to delete the stack while retaining resources failed to delete.

Correct Answer: A
This is a scenario of a resource drift problem. Even though it is possible to use drift detection in an AWS CloudFormation stack, solutions for a UPDATE_ROLLBACK_FAILED state could be manual changes to later re-synchronize to try a ContinueUpdateRollback action or just deleting the stack.
Incorrect Answers:
Options B, C, D are incorrect because protecting the stack from being deleted is not the right (if even relevant) way to proceed in a resource drift problem.
References:
https://go.aws/2YWd7Iu
https://amzn.to/2YOVIS1