单选题An administrator has a malfunctioning uninterruptible power supply （UPS）. Which of the following is the MOST likely cause of the problem？（）A Battery needs to be replacedB Light switch is turned offC Smart cable is disconnectedD UPS needs a firmware update
单选题
An administrator has a malfunctioning uninterruptible power supply （UPS）. Which of the following is the MOST likely cause of the problem？（）
A
Battery needs to be replaced
B
Light switch is turned off
C
Smart cable is disconnected
D
UPS needs a firmware update
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