Refer to the following configuration command.
router (config-line)# ntp master 10
Which statement about this command is true?

A.	The router acts as an authoritative NTP clock and allows only 10 NTP client connections.
B.	The router acts as an authoritative NTP clock at stratum 10.
C.	The router acts as an authoritative NTP clock with a priority number of 10.
D.	The router acts as an authoritative NTP clock for 10 minutes only.