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In telegraphy we generally use __________

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In telegraphy we generally use __________

(a) Amplitude modulation

(b) Frequency modulation

(c) Frequency Shift Keying

(d) Pulse Code modulation

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I'm obligated to ask this question of Representation of SSB-SC in Time & Frequency Domain topic in division SSB Modulation of Analog Communications

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The correct option is (c) Frequency Shift Keying

To elaborate: FSK (Frequency Shift Keying) is a method used to transmit binary data in form of digital signals. It is mainly used for telegraphy. In telegraphy, a modem is used to convert binary data to FSK and vice-versa, for the communication between computers and over telephone lines.

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