单项选择题In a Bridged 1483 network,which set of configuration commands allows the router to forward requests from the PC to an external DHCP server at 1.1.1.1?()
A.set dhcp relay set dhcp server 1.1.1.1
B.set dhcp relay agent set dhcp relay 1.1.1.1
C.enable dhcp relay enabled hcp server 1.1.1.1
D.enable dhcp relay agent enable dhcp relay 1.1.1.1