A.route add–net 192.168.1.0 gw 192.168.1.1netmask 255.255.255.0metric1
B.route add–net 172.16.1.0 gw 192.168.1.1netmask 255.255.255.255metric1
C.route add–net 172.16.1.0 gw 172.16.1.1netmask 255.255.255.0metric1
D.route adddefault 192.168.1.0 netmask 172.168.1.1metric1