单选题What information does the help reference command provide?（）AA brief description of commands and their default valuesBThe serial number and version number of the device used to open a support case with JTACCA list of all the active hardware alarms on the deviceDA display of the current configuration while in operational mode
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
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