Which bandwidth is used by Cisco TelePresence CTS-1000 for sending audio during an active call that excludes collaboration and audio add-in?

Which bandwidth is used by Cisco TelePresence CTS-1000 for sending audio during an active call that excludes collaboration and audio add-in?

A.
64 kb/s

B.
128 kb/s

C.
192 kb/s

D.
256 kb/s