Most Redundant Power Solution

C.

The most redundant power solution among the given options is option C - Two power supplies, each hooked up to separate 1-phase circuits.

Here's why:

Redundancy is a measure of a system's ability to continue functioning in the event of a failure of one or more components. A redundant power supply solution ensures that a server or other critical system will keep running even if one of the power supplies fails.

Option A - Two power supplies, each hooked up to individual legs of one 3-phase circuit, provides some redundancy because it uses two power supplies. However, since both power supplies are connected to the same 3-phase circuit, a failure of that circuit would take out both power supplies, leaving the server without power. Therefore, this solution is less redundant than option C.

Option B - Two power supplies, each hooked up to the same 1-phase circuit, is not a redundant solution at all. If the circuit fails, both power supplies will fail, leaving the server without power.

Option D - One power supply hooked up to two 1-phase circuits is also not a redundant solution. If one of the circuits fails, the server will lose power.

Option C - Two power supplies, each hooked up to separate 1-phase circuits, is the most redundant solution because it uses two power supplies, and each power supply is connected to a separate circuit. This means that if one circuit fails, the other circuit will continue to power the server. Therefore, this solution provides the highest level of redundancy among the given options.

In summary, option C is the most redundant power solution as it uses two power supplies, and each power supply is connected to a separate 1-phase circuit, which ensures that the server will keep running even if one of the circuits fails.