A Vehicle Stop at a Roadblock or Sobriety Checkpoint Is

A vehicle stop at a roadblock or sobriety checkpoint is:

A) totally different from a vehicle search,but is governed by the same rules.
B) not different from a vehicle search,but is governed by different rules.
C) totally different from a vehicle search,and each is governed by different rules.
D) not different from a vehicle search,but is governed by the same rules.