What is the command to authenticate an NTP time source?

What is the command to authenticate an NTP time source? (something in those lines)

What is the command to authenticate an NTP time source? (something in those lines)

A.
#ntp authentication-key 1 md5 141411050D 7

B.
#ntp authenticate

C.
#ntp trusted-key 1

D.
#ntp trusted-key 1

Explanation:
The command “ntp authenticate” authenticates the time source.
The command “ntp authentication-key” is the authentication key for trusted time sources.
See the following from a live router:
R1(config)# ntp ?
access-group Control NTP access
allow Allow processing of packets
authenticate Authenticate time sources
authentication-key Authentication key for trusted time sources



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