A user using a CP-9971 SIP phone reports that during a video call, the video portion of the call freezes. What should you do in order to point to and troubleshoot the issue?

A.	Restart the phone.
B.	On the phone, navigate to Administrator Settings > Status > Call Statistics > Video > Video statistics > Rcvr Packets statistics. Verify if the phone is receiving packets.
C.	Make sure that the camera is connected to the USB.
D.	Verify if the camera shutter is open.
E.	Perform a factory reset of the phone.