While on a call, using the remote control, how do you add an additional participant to a call on your MultiSite-enabled endpoint?
A. Press the Home button to return to the menu, and select the Add Participant button.
B. Press and hold the End Call key to bring up the dialing menu.
C. Press and hold the Call key to bring up the dialing menu.
D. Press the Call key, and choose or dial the number of the additional participant.