A . route ip 172.0.0.0 255.0.0.0s0B . ip route 0.0.0.00.0.0.0 172.16.20.1C . ip route 0.0.0.0255.255.255.255 172.16.20.1D . route ip 0.0.0.0255.255.255.0 172.16.10.1150
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