Which IOS command is used to define the authentication key for NTP?

Which IOS command is used to define the authentication key for NTP?
A . Switch(config)#ntp authentication-key 1 md5 C1sc0
B . Switch(config)#ntp trusted-key 1
C . Switch(config)#ntp source 192.168.0.1
D . Switch(config)#ntp authenticate

View Answer

Answer: A