Question id 234 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

The airspace designation normally will not change
The airspace reverts to Class E or a combination of Class E and G airspace during the hours the tower is not in operation
The airspace remains Class D airspace as long as a weather observer or automated weather system is available.

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane