Line-of-Sight (LOS) communication is only possible when the frequen...

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Line-of-Sight (LOS) communication is only possible when the frequency is
(a) above \( 40 \mathrm{MHz} \)
(b) above \( 40 \mathrm{kHz} \)
(c) equal to \( 40 \mathrm{MHz} \)
(d) below \( 40 \mathrm{MHz} \)
\( \mathrm{P} \)
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