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(D) Radio waves can propagate from one place to another using different modes depending on their frequency range:$1$. Ground wave propagation: Used fo

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All of the above

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(D) Radio waves can propagate from one place to another using different modes depending on their frequency range:$1$. Ground wave propagation: Used for low frequencies (up to $2 	ext{ MHz}$), where waves follow the curvature of the Earth.$2$. Sky wave propagation: Used for medium and high frequencies ($3 	ext{ MHz}$ to $30 	ext{ MHz}$), where waves are reflected by the ionosphere.$3$. Space wave propagation: Used for very high frequencies (above $30 	ext{ MHz}$), where waves travel in a straight line (line-of-sight) between transmitting and receiving antennas.Since all three methods are standard modes of radio wave propagation, the correct answer is $D$.

Which types of communication modes are used for the propagation of radio waves from one place to another?

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