Which feature or features will work on a new Cisco TelePresence VCS as soon as the IP configuration is done?

Which feature or features will work on a new Cisco TelePresence VCS as soon as the IP
configuration is done?

A.
H.323, SIP, Interworking, and Firewall Traversal

B.
H.323

C.
H.323 and SIP

D.
H.323, SIP, and Interworking