路由器A的配置为： Quidway#SHOW RUN Now create configuration... Current configuration ! f

rame-relay switching ! interface Ethernet0 ip address 10.1.1.1 255.255.0.0 ip rip version 2 mcast ! interface Serial0 clock-select DTECLK1 encapsulation frame-relay frame-relay intf-type DCE frame-relay interface-dlci 100 ip address 2.1.1.1 255.0.0.0 ip rip version 2 mcast ! interface Serial1 encapsulation ppp ! interface Serial2 flowcontrol normal async mode dedicated encapsulation ppp ! exit router rip no auto-summary neighbor 2.1.1.2 ! end 路由器B的配置为 Quidway#SHOW RUN Now create configuration... Current configuration ! ! interface Ethernet0 ip address 10.2.1.1 255.255.0.0 ip rip version 2 mcast ! interface Serial0 encapsulation frame-relay ip address 2.1.1.2 255.0.0.0 ip rip version 2 mcast ! interface Serial1 encapsulation ppp ! interface Serial2 flowcontrol normal async mode dedicated encapsulation ppp ! exit router rip no auto-summary neighbor 2.1.1.1 ! End 如下说法正确的是

A、两端广域网可以联通，但局域网不可以连通 B、两端广域网不可以连通，但局域网可以连通 C、广域网和局域网都可以连通 D、广域网和局域网都不能连通