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In which modulation discrete values of carrier frequencies is used to transmit binary data ? 

In which modulation discrete values of carrier frequencies is used to transmit binary data ?  Correct Answer Frequency Shift Keying 

The correct answer is option 3

Explanation:

Frequency Shift Keying or FSK is a scheme of frequency modulation in which the frequency of the carrier signal varies according to the digital signal changes.

It is used to transmit digital information over wireless medium.

The output of a FSK modulated wave is high in frequency for a binary High input and is low in frequency for a binary Low input.

The binary 1s and 0s are called Mark and Space frequencies respectively.

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