Which of the following is the MOST redundant power solution?

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Which of the following is the MOST redundant power solution?
A . Two power supplies, each hooked up to individual legs of one 3-phase circuit.
B . Two power supplies, each hooked up to the same 1-phase circuit.
C . Two power supplies, each hooked up to separate 1-phase circuits.
D . One power supply hooked up to two 1-phase circuits.

Answer: C