Which of the following is the correct statement? (a) Electromagneti...

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Which of the following is the correct statement?
(a) Electromagnetic wave of frequencies higher than \( 30 \mathrm{MHz} \) penetrates the ionosphere and escape
(b) Electromagnetic wave of frequencies higher than \( 30 \mathrm{kHz} \), penetrates the ionosphere and escape
(c) Electromagnetic wave of frequencies lower than \( 30 \mathrm{MHz} \) penetrates the ionosphere and escape
(d) Electromagnetic wave of frequencies lower than \( 30 \mathrm{kHz} \) penetrates the ionosphere and escape
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