Which parameter should be set to prevent H.323 endpoints from registering to Cisco TelePresence Video Communication Server automatically?

Which parameter should be set to prevent H.323 endpoints from registering to Cisco TelePresence Video Communication Server automatically?
A . On the VCS, navigate to Configuration, Protocols,
B . 323, and set Auto Discover to off.
C . On the VCS, navigate to Configuration, Protocols,
D . 323, and set Auto Registration to off.
E . On the VCS, navigate to Configuration, Registration, Allow List, and set Auto Registration to off.
F . On the VCS, navigate to Configuration, Registration, Configuration, and set Auto Registration to off.

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Answer: A