What Does an Amazon SQS Delay Queue Accomplish

What does an Amazon SQS delay queue accomplish?

A) Messages are hidden for a configurable amount of time when they are first added to the queue.
B) Messages are hidden for a configurable amount of time after they are consumed from the queue.
C) The consumer can poll the queue for a configurable amount of time before retrieving a message.
D) Message cannot be deleted for a configurable amount of time after they are consumed from the queue.