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What does an endpoint system use to navigate the Auto Attendant menu on the Cisco TelePresence MCU?

What does an endpoint system use to navigate the Auto Attendant menu on the Cisco TelePresence MCU?
A. FECC or DTMF navigation
B. a special remote that came with the Cisco TelePresence MCU
C. only FECC; DTMF is not supported
D. web interface of the endpoint
Answer: A