【单选题】
A routeadd–net192.168.1.0gw192.168.1.1netmask255.255.255.0metric1
B routeadd–net172.16.1.0gw192.168.1.1netmask255.255.255.255metric1
C routeadd–net172.16.1.0gw172.16.1.1netmask255.255.255.0metric1
D routeadddefault192.168.1.0netmask172.168.1.1metric1
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