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A server with redundant power supplies connected to two different UPS units fails to gracefully shut down during a power outage. A technician has verified cables and both UPS units are properly connected. Which of the following hardware tools should the technician use to further troubleshoot this issue?
Perceptual Constancy
The brain's ability to perceive objects as unchanging despite changes in viewing conditions, such as distance or lighting.
Retinal Images
Images formed on the retina of the eye as the result of the refraction of light by the cornea and lens.
Relative Size
A perceptual cue that allows the determination of depth and distance by comparing the size of objects with known sizes.
Retinal Disparity
The slight difference in the visual images that each eye perceives because of the different angles in which each eye views the world.
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