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By which two ways can an endpoint join a conference on the Cisco TelePresence MCU? (Choose two.)

By which two ways can an endpoint join a conference on the Cisco TelePresence MCU? (Choose two.)
A. dialing a registered alias for the conference
B. dialing the auto attendant and navigating to the conference
C. dialing an endpoint that is already in the conference
D. dialing all endpoints that are required in the conference
E. dialing the PIN number of the conference
Answer: AB