【单选题】
A route add-net 192.168.1.0gw 192.168.1.1 netmask 255.255.255.0 metric
B route add-net 172.16.1.0gw 192.168.1.1 netmask 255.255.255.0 metric
C route add-net 172.16.1.0gw 172.16.1.1 netmask 255.255.255.0 metric
D route add-net default 192.168.1.0netmask 172.168.1.1 metric
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