Which of the following environmental controls is appropriate to protect computer equipment
against short-term reductions in electrical power?

A.
Power line conditioners

B.
Surge protective devices

C.
Alternative power supplies

D.
Interruptible power supplies

Explanation:

Power line conditioners are used to compensate for peaks and valleys in the power supply and
reduce peaks in the power flow to what is needed by the machine. Any valleys are removed by

power stored in the equipment. Surge protection devices protect against high-voltage bursts.
Alternative power supplies are intended for computer equipment running for longer periods and
are normally coupled with other devices such as an uninterruptible power supply (UPS) to
compensate for the power loss until the alternate power supply becomes available. An interruptible
power supply would cause the equipment to come down whenever there was a power failure.