Which two are requirements for a device to join a Cisco UC520 created community? Select two

Which two are requirements for a device to join a Cisco UC520 created community? Select two.

A.
Cisco Configuration Assistant installed on user PC’s

B.
Teleworker access routes must be preconfigured with a VPN

C.
No use of IP addresses

D.
HTTPS enable on the Cisco CE520

E.
Telnet disabled on the Cisco CE520