According to the Wyoming Supreme Court in O'Boyle, under what conditions may an officer ask questions that are not reasonably related to the scope of the initial stop?

a) When the subject refuses to speak with the officer.
b) When the officer believes the subject may be armed.
c) When the officer has gained the voluntary consent of the subject to ask questions.
d) When the officer has reasonable suspicion or probable cause the subject is involved in other criminal activity.
e) When the subject is driving a rental vehicle.