We do not transmit low frequency signal to long distance because A. The size of antenna should ...

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We do not transmit low frequency signal to long distance because

A. The size of antenna should be comparable to signal wavelength which is unreal solution for a signal of longer wavelength.
B. Effective power radiated by a long wavelength baseband signal would be high.
C. We want to avoid mixing up signals transmitted by different transmitted simultaneously.
D. Low frequency signal can be sent to long distance by superimposing with a high frequency wave as well.
Therefore, the most suitable options will be:
(a) All statement are true
(b) (A), (B) and (C) are true only
(c) (A), (C) and (D) are true only
(d) (B), (C) and (D) are true only
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