Which two statements about Cisco IOS XR NTP configuration are true? (Choose two.)

Which two statements about Cisco IOS XR NTP configuration are true? (Choose two.)
A . A network device can obtain NTP time information in three ways: polling the NTP server, listening to NTP broadcasts, and listening to NTP multicasts.
B . NTP authentication supports MD5, SHA1, or SHA2.
C . Client mode is a peer-to-peer mode.
D . The two types of poll-based NTP associations are client mode and symmetric active mode.
E . The Cisco IOS-XR implementation of NTP supports stratum 1 service.
F . In client mode, clients can dynamically learn the NTP sever IP address by listening to the NTP server broadcasts or multicasts.

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Answer: A,D