Which of the following statements is incorrect? (a) Ground wave pro...

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Which of the following statements is incorrect?
(a) Ground wave propagation can be sustained at frequencies \( 500 \mathrm{kHz} \) to \( 1500 \mathrm{kHz} \)
(b) Satellite communication is useful for the frequencies above \( 30 \mathrm{MHz} \)
(c) Sky wave propagation is useful in the 50 to \( 80 \mathrm{MHz} \)
(d) Space wave propagation takes place through tropospheric space
(e) The phenomenon involved in sky wave propagation is total internal reflection
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