Why is Cisco TelePresence Interoperability Protocol (TIP) needed in a network?

A.
It allows CTS endpoints and other other devices that can only with two media streams to connect

B.
It permits audio and video streams to be transmitted across the WAN

C.
It allows for multiple video and audio conferences to be conducted simultaneously

D.
It allows for standard-definition video conference streams to be converted up to 1080p