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.