浮动静态路由的正确语法是什么？ A: ip route 0.0.0.0 0.0.0.0 S0/0/0 B: ip route 172.16.0.0 255.248.0.0 10.0.0.1 C: ip route 209.165.200.228 255.255.255.248 S0/0/0 D: ip route 209.165.200.228 255.255.255.248 10.0.0.1 120

浮动静态路由的正确语法是什么？（ ） A: ip route 209.165.200.228 255.255.255.248 serial 0/0/0 B: ip route 0.0.0.0 0.0.0.0 serial 0/0/0 C: ip route 172.16.0.0 255.248.0.0 10.0.0.1 D: ip route 209.165.200.228 255.255.255.248 10.0.0.1 120