You have several Cloudformation stacks in your IT organization. Which of the following command will help you see all the cloudformation stacks that have been deleted three months earlier?

Answer options:

A.describe-stacks
B.list-stacks
C.stacks-complete
D.list-templates

Answer - B
The following is the description of the list-stacks command.
Returns the summary information for stacks whose status matches the specified StackStatusFilter. Summary information for stacks that have been deleted is kept for 90 days after the stack is deleted. If no stack-status-filter is specified, summary information for all stacks is returned (including existing stacks and stacks that have been deleted).
For more information on the list-stacks command, please visit the below link
http://docs.aws.amazon.com/cli/latest/reference/cloudformation/list-stacks.html