The HUC Notices a Visitor Who Is Using Threatening Gestures

The HUC notices a visitor who is using threatening gestures when talking to a nurse.The best course of action for the HUC is to:

A) call the nurse manager to assess the situation.
B) immediately look at the schedule to see if there is a male orderly working and call him.
C) approach the visitor,gently ask what the problem is,and attempt to solve the matter.
D) present a calm attitude and call security immediately.