If There Has Been a Lawful Impoundment of a Vehicle,police

Multiple Choice

If there has been a lawful impoundment of a vehicle,police may conduct an inventory search:

A) automatically,if there is no bad faith on the part of the police and to do so is authorized by department policy.
B) only on reasonable suspicion.
C) only on probable cause,but no warrant is required.
D) only on probable cause supported by a warrant.