The equation v(t) = A cos [ωct + φ(t)] where A and ωc are constant – McqOptions

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1.	The equation v(t) = A cos [ωct + φ(t)] where A and ωc are constant and φ(t) is a function of base signal represents Phase modulationAmplitude modulationAngle modulationFrequency modulation Which of the above are true?
A.	3 only
B.	1, 3 and 4
C.	1, 2, 3, 4
D.	3 and 4 only
Answer» C. 1, 2, 3, 4

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