Which is the core reason why video conferencing supports public and private network traversal?

Which is the core reason why video conferencing supports public and private network traversal?
A . There is a firewall or NAT, so public and private network traversal must be supported.
B . Signaling and media transmission channels are not unified
C . There is a media transmission address in the signaling, and the NAT device only performs address translation on the IP header, so public and private network traversal processing is required.
D . Because the network performs address translation on IP packets

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Answer: C