单选题What information does the help reference command provide?（）A A brief description of commands and their default valuesB The serial number and version number of the device used to open a support case with JTACC A list of all the active hardware alarms on
题目
单选题
What information does the help reference command provide?（）
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