Part of the configuration files for routers testking1 and testking2 are displayed below: If you were to enter the "show interface serial 0" command on router testking1,which of the following will be displayed?()
- A Serial 0 is down, line protocol is down
- B Serial 0 is up, line protocol is up
- C Open: IPCP, CDPCP
- D LCP closed
- E LCP ope