Which two statements about NTP operations are true? (Choose two)

Which two statements about NTP operations are true? (Choose two)
A . Cisco routers can act only as NTP servers
B . NTP uses TCP over IP
C . NTP uses UDP over IP
D . Cisco routers can act as both NTP authoritative servers and NTP clients
E . Cisco routers can act only as NTP clients

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Answer: CD