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C. Passive Gain
CHAPTER 2 - PAGE 60-61 (Official Study Guide)
"[...] is an increase in the amplitude of the signal, in a favored direction, by focusing or directing the output power."
"Antennas are used to provide intentional passive gain in wireless networks using RF signals."
C is correct
Passive gain is accomplished by focusing the RF signal with the use of an antenna, does not require an external power source & Internal workings of the antenna focus the signal more powerfully in one direction than another.
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