Which of the following refers to a US Government program that reduces
or eliminates emanations from electronic equipment?

A.
ECHELON

B.
TEMPEST

C.
ECHO

D.
CLIPPER

Explanation:
Answer CLIPPER refers to the US government Escrowed Encryption Standard.
Answer ECHELON refers to the large-scale monitoring of RF transmissions.
Answer ECHO is a distracter.