What is the functionality of the UPS?

What is the functionality of the UPS?
A . Communicates with iDRAC of the servers to balance the load across multiple servers
B . Provides constant power boost by combining input from multiple power grids
C . Servers can only operate with 220v input voltage; it acts as a converter in 110v power grids
D . Provides temporary power source to allow for a graceful system shutdown in case of a power failure

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Answer: D