路由器R1配置DHCP,网关为192.168.1.1,DNS为210.1.1.1,下列配置命令正确的是()
A.R1(config)#default-router 192.168.1.1 -------------------R1(config)#dns-server 210.1.1.1 B.R1(dhcp-config)#dns-server 192.168.1.1 -------------------R1(dhcp-config)#default-router 210.1.1.1 C.R1(dhcp-config)#default-router 192.168.1.1 -------------------R1(dhcp-config)#dns-server 210.1.1.1 D.R1#dns-server 192.168.1.1 -------------------R1#default-router 210.1.1.1