单项选择题
A.Router>B.Router(config-if)#C.Router#D.Router(config)#
A.192.168.9.64/28B.192.168.9.146/28C.192.168.9.96/28D.192.168.9.129/26E.192.168.9.51/26F.192.168.9.64/26
A.172.16.128.0、255.255.255.224B.172.16.128.0、255.255.0.0C.172.16.128.0、255.255.192.0D.172.16.128.0、255.255.224.0E.172.16.128.0、255.255.255.192