Which command is used to configure a switch as an authoritative NTP server?

Which command is used to configure a switch as an authoritative NTP server?
A. switch(config)#ntp master 3
B. switch(config)#ntp peer 193.168.2.2
C. switch(config)#ntp server 193.168.2.2
D. switch(config)#ntp source 193.168.2.2

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