![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-53/ti_inject-812ce.png)
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