which condition is the Cisco MXE 5600 involved in a video call?

Under which condition is the Cisco MXE 5600 involved in a video call?

A.
any point-to-point video call

B.
a video call that is placed between a Cisco TelePresence endpoint and a dissimilar video conferencing endpoint

C.
a video call that is placed between any two dissimilar endpoints

D.
any point-to-point or multipoint video call