Which guideline should you follow when installing equipment in a server rack?

Which guideline should you follow when installing equipment in a server rack?

A.
The equipment that produces the most heat should be installed at the top of the rack.

B.
The monitor should be installed in the middle of the rack.

C.
The equipment that requires the most vertical space should be installed at the top of the rack.

D.
The heaviest equipment should be installed at the bottom of the rack.