With Regard to the Factual Foundation Required to Support Border

With regard to the factual foundation required to support border searches:
I. reasonable suspicion supports a strip search.
II. no warrant, probable cause, or reasonable suspicion is required for a
Routine border search.
III. probable cause is required for body cavity searches.
IV. none of the above

A) I
B) IV
C) I, II, III
D) II, III