To provide firewall traversal, which components are needed?
A.
2 Cisco TelePresence Video Communication Server Controls
B.
1 Cisco TelePresence Video Communication Server Control 2 Cisco TelePresence Video Communication Server Expressways
C.
2 Cisco TelePresence Video Communication Server Expressways
D.
1 Cisco TelePresence Video Communication Server Control 1 Cisco TelePresence Video Communication Server Expressway