Which of the following are the advantages of UPS 2N system?

Which of the following are the advantages of UPS 2N system?
A . Power supply redundancy, the UPS system can be maintained without switching the load to maintenance bypass mode, and there is no single path failure point
B . The hardware configuration cost is low, and the UPS works under the designed high load conditions with the highest efficiency and higher reliability than the mains.

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Answer: A