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At what distance from the antenna does the far field start?

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At what distance from the antenna does the far field start?

(a) 2 wavelengths

(b) 5 wavelengths

(c) 10 wavelengths

(d) 25 wavelengths

I got this question in class test.

I'd like to ask this question from Antenna Fundamentals topic in division Antennas and Wave Propagation of Avionics

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Correct choice is (c) 10 wavelengths

Explanation: The far field that is approximately 10 wavelengths from the antenna is the radio wave with the composite electric and magnetic fields. For example, at 2.4 GHz, one wavelength is 984/2400 = 0.41 feet. The far field is 10 times that, or 4.1 ft or beyond.

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