Which of the following is required to allow placing and receiving URI calls through firewall?

A.
DNS zone and DNS servers should be configured only on the VCS Expressway.

B.
Traversal design behind the firewall should have DNS zones and DNS servers
configured

C.
DID and FindMe must be configured

D.
DNS records should be configured with the address of the VCS as authontative
gatekeeper or proxy for enterprise.