consider a task T. Write a code to execute in 30 seconds from now, but expires after 3 minutes.
a) T.apply_async(countdown=30, expires=180)
b) T.apply_async(countdown=30, expires=3min)
c) T.apply_async(timedelta(seconds=30), expires=180)
d) T.apply_async(countdown=180, expires=30)
