In amplitude modulation, sinusoidal carrier frequency used is denoted by ωc, and the signal frequency is denoted by ωm. The band width (Δωm) of the signal is such that Δωm << ωc. Which of the following frequencies is not contained in the modulated wave?
(a) ωc
(b) ωm + ωc
(c) ωc - ωm
(d) ωm