When you register the Cisco TelePresence System 500-32 video system with the Cisco Unified Communications Manager, what is the most important item for the registration to be input into the server?

When you register the Cisco TelePresence System 500-32 video system with the Cisco Unified Communications Manager, what is the most important item for the registration to be input into the server?
A . the IPv4 address of the Cisco TelePresence System 500-32
B . the IP telephone media access control address that is used to manage the system
C . the media access control address of the Ethernet port of the Cisco TelePresence System 500-32
D . The Cisco TelePresence System 500-32 will always automatically register with the Cisco Unified Communications Manager server.

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Answer: C