用标准访问控制列表禁止非法地址l97．178．0．0/16的数据包进出路由器的正确配置是（　　）。

A.access—list l 10 deny l9．7．178．0．0 0．0．255．255access—list l 10 permit any
B.access—list 10 deny l97．178．0．0 255,255．0．0access—list 10 permit any
C.access-1ist 50 permit anyaccess-list 50 deny l97．178．0．0 0．0．255．255
D.access-list 99 deny l97．178．0．0 0．0．255．255access-list 99 permit any