When setting the pedestal height on a new Cisco TelePresence System 500 installation, what is the correct procedure for proper adjustment?

A.
Loosen the height adjustment knob and push down the monitor until you believe that it is low enough for the user

B.
Install the height label 8 inches (20 cm) down from the top on the side of the pedestal stand and lower it to set it for the proper gender

C.
Have the user sit in a chair and measure his or her eye level. Loosen the heigt adjustment knob and push down the monitor to set the height LED to eye level

D.
Loosen the height adjustment knob and adjust the camera level to eye level