When comparing an ATX 20-pin power cable to an ATX 24-pin power cable, which of the following voltage values is found on the four extra pins?

When comparing an ATX 20-pin power cable to an ATX 24-pin power cable, which of the following voltage values is found on the four extra pins?
A. +3.3v, +5v, and two grounds
B. +3.3v, +5v, +12v, and ground
C. +3.3v, -5v, +12v, and ground
D. +5v, -5v, +12v, and ground

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