下面哪条命令用于在路由器上添加一条默认路由？（）

A、Router#ip route 0.0.0.0 0.0.0.0 192.168.100.1

B、Router#ip route 0.0.0.0 255.255.255.255 192.168.100.1

C、Router（Config）#ip route 0.0.0.0 0.0.0.0 192.168.100.1

D、Router（Config）#ip route 0.0.0.0 255.255.255.255 192.168.100.1

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