Which of the following is a type of digital modulation technique used in telecommunication systems that represents digital data as variations in the phase of the carrier wave.

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A) Amplitude Shift Keying (ASK)
B) Frequency Shift Keying (FSK)
C) Phase Shift Keying (PSK)
D) Quadrature Amplitude Modulation (QAM)
Answer: C) Phase Shift Keying (PSK)

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