If More Than One Physician Is Involved in a Case

If more than one physician is involved in a case, what priority order is used to determine the physician listed in form locator 17?
A)Ordering Provider, Referring Provider, Supervising Provider
B)Referring Provider, Supervising Provider, Ordering Provider
C)Supervising Provider, Ordering Provider, Referring Provider
D)Referring Provider, Ordering Provider, Supervising Provider