客户机使用自动获取ip地址的方式,获取的ip地址为172.168.20.0网段,则配置的命令为( ) A: [H3C] dhcp enable[H3C-dhcp-pool-test]gateway-list 172.168.20.0 B: [H3C] dhcp enableH3C-dhcp-pool-tet]network 172.168.20.0 C: [H3C] dhcp enable[H3C-dhcp-pool-test]dns-list 172.168.20.0 D: [H3C] dhcp enable[H3C]dhcp server forbidden-ip 172.168.20.0