How are firewall traversal connections established between the Cisco TelePresence VCS Expressway and Control?
A. The traversal client establishes connections outbound to the traversal server.
B. The traversal server establishes connections inbound to the traversal client.
C. Connections are established in both directions from the traversal server to the traversal client.
D. The traversal server negotiates acceptable connection ports with the firewall.
answer is clear.