单选题TestKing.com is configuring the serial interface of a Cisco router to connect to the router of a new ISP. A full T1 is being used for the Internet connection. After issuing the show interface serial 0/0 command, it is observed that the interface is UP and the line protocol is DOWN. Which of the following commands could fix this problem?（）ABorder# copy running-config startup-configBBorder(config)# no shutdownCBorder(config-if)# encapsulation pppDBorder(config-if)# no cdp enableEBorder(config-if)# ip routing
单选题
TestKing.com is configuring the serial interface of a Cisco router to connect to the router of a new ISP. A full T1 is being used for the Internet connection. After issuing the show interface serial 0/0 command, it is observed that the interface is UP and the line protocol is DOWN. Which of the following commands could fix this problem?（）
A
Border# copy running-config startup-config
B
Border(config)# no shutdown
C
Border(config-if)# encapsulation ppp
D
Border(config-if)# no cdp enable
E
Border(config-if)# ip routing
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