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What does the Cisco TelePresence MCU service prefix do?

What does the Cisco TelePresence MCU service prefix do?
A. ensures that all H323 calls beginning with the prefix are routed to the Cisco TelePresence MCU
B. is added to all aliases before registration
C. diverts calls to the default auto attendant
D. identifies which services the Cisco TelePresence MCU will offer in each configured meeting room
Answer: A