在一台Cisco路由器的g3/1接口，封禁ICMP协议，只允许转发168.105.129.0/24子网的ICMP数据包，正确的访问控制列表的配置是（）。

A.Router(config)#interface g3/1 Router(config-if)#ip access-group 198 in Router(config-if)#ip access-group 198 out Router(config-if)#exit Router(config)#access-list 198 permit icmp 168.105.129.0 0.0.0.255 any Router(config)#access-list 198 deny icmp any any Router(config)#access-list 198 permit ip any any
B.Router(config)#access-list 2000 permit icmp 168.105.129.0 0.0.0.255 any Router(config)#access-list 2000 deny icmp any any Router(config)#access-list 2000 permit ip any any Router(config)#interface g3/1 Router(config-if)#ip access-group 2000 in Router(config-if)#ip access-group 2000 out Router(config-if)#exit
C.Router(config)#access-list 198 deny icmp any any Router(config)#access-list 198 permit icmp 168.105.129.0 0.0.0.255 any Router(config)#access-list 198 permit ip any any Router(config)#interface g3/1 Router(config-if)#ip access-group 198 out Router(config-if)#exit
D.Router(config)#access-list 100 permit icmp 168.105.129.0 0.0.0.255 any Router(config)#access-list 100 permit ip any any Router(config)#access-list 100 deny icmp any any Router(config)#interface g3/1 Router(config-if)#ip access-group 100 in Router(config-if)#exit

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参考答案：B

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