MCU Video Firewall Mode has advantages, but it also has limitation, such as (). (Select 3 answers)

MCU Video Firewall Mode has advantages, but it also has limitation, such as (). (Select 3 answers)
A . The MCU supports communication between only two networks. The communication among more than two networks, however, is not supported.
B . The GE0 port must register with a G
C . The GE1 port is used only for calls by number
D . The endpoint at the GE1 side does not support the SiteCall service.
E . Sites connected through GE1 ports does not support service switchovers.

Answer: ACD