Which option is a possible source for TMS phone books?

Which option is a possible source for TMS phone books?
A . Active Messaging
B . Gatekeeper
C . System Network Directory
D . Cisco Instant Message and Presence server

Answer: C

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Pablo
Pablo
3 years ago

Why is not the B Gatekeeper?
Gatekeeper is listed when you chose the sources of a phone book.
Thanks.