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Wireless transmission of signals can be done via ___________

(a) radio waves

(b) microwaves

(c) infrared

(d) all of the mentioned

I have been asked this question in examination.

I would like to ask this question from Physical Layer in chapter OSI Model of Computer Network

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Right answer is (d) all of the mentioned

To elaborate: Wireless transmission is carried out by radio waves, microwaves and IR waves. These waves range from 3 Khz to above 300 Ghz and are more suitable for wireless transmission. Radio waves can penetrate through walls and are used in radio communications, microwaves and infrared (IR) waves cannot penetrate through walls and are used for satellite communications and device communications respectively.

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