An engineer is configuring switch SW1 to act as an NTP server when all upstream NTP server connectivity fails. Which configuration must be used?

An engineer is configuring switch SW1 to act as an NTP server when all upstream NTP server connectivity fails. Which configuration must be used?

A. SW1# config t SW1(config)#ntp peer 192.168.1.1 SW1(config)#ntp access-group peer accesslist1 B. SW1# config t SW1(config)#ntp master SW1(config)#ntp server192.168.1.1 C. SW1# config t SW1(config)#ntp backup SW1(config)#ntp server192.168.1.1 D. SW1# config t SW1(config)#ntp server192.168.1.1 SW1(config)#ntp access-group peer accesslist1