The number of UPS5000-E batteries can be adjusted. When one battery becomes faulty, you should remove at least () batteries and set the corresponding battery quantity on the monitoring panel.

The number of UPS5000-E batteries can be adjusted. When one battery becomes faulty, you should remove at least () batteries and set the corresponding battery quantity on the monitoring panel.
A . 1
B . 2
C . 3
D . 4

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Answer: B