What is the advantage of having a redundant power supply?

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What is the advantage of having a redundant power supply?

It can be used to power high-performance graphic cards.
It provides a Field Replacement Unit for immediate replacement in the event of a power supply failure.
It allows for the replacement of the faulty power supply without loss of power to the server.
It can be linked to increase the wattage required for the newer processors.

Explanation: A redundant power supply is hot-swappable. This allows the faulty power supply to be replaced without losing power to the computer.