Which of the following statements about battery packs in UPS systems is wrong?

Which of the following statements about battery packs in UPS systems is wrong?
A . When the AC power input is normal, the AC power will charge the battery pack.
B . Batteries are an important part of data center infrastructure and can provide power to back-end loads in the event of a utility power outage.
C . If the UPS input voltage and frequency are wide, the battery life can be extended.
D . When the inverter fails, the battery pack can still supply power to the rear-end load.

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Answer: D