A new server rack is being installed that includes three server UPS (Uninterruptible Power Supply) units. Where should the server UPS (Uninterruptible Power Supply) units be placed?

A.
one on top, one in the middle, and one on the bottom of the rack

B.
in the middle of the rack to reduce cable distance

C.
at the top of the rack because they produce the most heat

D.
at the bottom of the rack for stability