How is TIP defined?

How is TIP defined?
A . TIP multiplexes RTP ports to reduce the number of video streams required in calls between any
B . 323 and SIP endpoint. Whether they are immersive endpoints or non-immersive endpoints.
C . TIP allows communication between any immersive and non-immersive endpoint.
D . TIP allows communication between any endpoint, regardless of what protocol is used
E . TIP multiplexes RTP ports to reduce the number of video streams required in cars between immersive endpoints.

Answer: A