Which of the Following Is the MOST Redundant Power Solution

Multiple Choice

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.