Which of the following statement(s) is/are correct regarding ground...

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Which of the following statement(s) is/are correct regarding ground wave propagation?
I. A wave induces current in the ground over which it passes and surrounding particle.
II. It is attenuated as a result of absorption of energy by the Earth and surrounding particle.
-III. The attenuation of surface waves decreases very rapidly with increase in frequency.
IV. The maximum range of coverage depends on the transmitted power and frequency (less than a few \( \mathrm{MHz}) \).
(a) I and II
(b) I and III
(c) I, II and IV
(d) All of these
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