Which four modes are available on the Cisco TelePresence MCU MSE 8510 to connect to a gatekeeper?

Which four modes are available on the Cisco TelePresence MCU MSE 8510 to connect to a
gatekeeper? (Choose four.)

A.
direct mode

B.
H.225-routed mode

C.
H.265-routed mode

D.
H.245-routed mode

E.
full proxy mode

F.
partial proxy mode