Which command do you use to identify the meaning of a syslog message?（）

A. A brief description of commands and their default values
B. The serial number and version number of the device used to open a support case with JTAC
C. A list of all the active hardware alarms on the device
D. A display of the current configuration while in operational mode

A. user@router# ping 10.10.10.1
B. user@router# run ping 10.10.10.1
C. user@router> ping 10.10.10.1
D. user@router> request ping 10.10.10.1

A. [edit interfaces]   user@router# run ping 1.1.1.1
B. [edit interfaces]   user@router# ping 1.1.1.1
C. [edit interfaces]   user@router# up ping 1.1.1.1
D. [edit interfaces]   user@router# exit ping 1.1.1.1