封禁ICMP协议，只转发212．78．170．166/。27所在子网的所有站点的ICMP数据包，正确的access·lis!配置是（　　）。

A.Router (config) #access-list 110 permit icmp 212.78. 170. 166 O. 0. O. 0 anyRouter (config)#access-list 110 deny icmp any anyRouter (config)#access-list 110 permit ip any any
B.Router (config) #access-list 110 permit icmp 212.78. 170.0 255. 255. 255. 224 anyRouter (config) #access-list 110 permit ip any anyRouter (config)#access-list 110 deny icmp any any
C.Router (config) #access-list 110 permit icmp 212.78. 170.0 0. O. 0. 255 anyRouter (config)#access-list 110 deny icmp any anyRouter (config)#access-list 110 permit ip any any
D.Router (config) #access-list 110 permit icmp 212.78. 170. 160 0.0.0.31 anyRouter (config) #access-list 110 deny icmp any anyRouter (config)#access-list 110 permit ip any any