A . route add–net192.168.1.0 gw192.168.1.1 netmask255.255.255.0 metric1
B . route add–net172.16.1.0 gw192.168.1.1 netmask255.255.255.255 metric1
C . route add–net172.16.1.0 gw172.16.1.1 netmask255.255.255.0 metric1
D . route add default192.168.1.0netmask172.168.1.1 metric1
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