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Which status represents a failure state in AWS CloudFormation?

A.
UPDATE_COMPLETE_CLEANUP_IN_PROGRESS

B.
DELETE_COMPLETE_WITH_ARTIFACTS

C.
ROLLBACK_IN_PROGRESS

D.
ROLLBACK_FAILED

Explanation:
ROLLBACK_IN_PROGRESS means an UpdateStack operation failed and the stack is in the process of trying to return
to the valid, pre-update state. UPDATE_COMPLETE_CLEANUP_IN_PROGRESS means an update was successful,
and CloudFormation is deleting any replaced, no longer used resources. ROLLBACK_FAILED is not a CloudFormation
state (but UPDATE_ROLLBACK_FAILED is). DELETE_COMPLETE_WITH_ARTIFACTS does not exist at all.
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks.html

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