Which of the following networking types best meets the needs of the site?

A certain SMC video conferencing system site hopes to converge the number of single-select ports on the firewall to deploy the conference system, and a DMZ area is planned.

Which of the following networking types best meets the needs of the site?
A . Back-to-back method
B . SIP proxy method
C . Dual plane networking mode
D . Neighbor approach

Answer: A