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Communication Systems - Engineering

Q1:

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
  1. Phase modulation
  2. Amplitude modulation
  3. Angle modulation
  4. Frequency 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

ANS:B - 1, 3 and 4

This equation can represent frequency, angle and phase modulation.