A signal m(t) is multiplied by a sinusoidal waveform of frequency fc such that v(t)=m(t) cos 2pfct If Fourier transform of m(t) is M(f), Fourier transform of v(t) will be

• 0.5 M(f + fc)
• 0.5 M(f - fc)
• 0.5 M(f + fc) + 0.5 M(f - fc)
• 0.5 M(f - fc) + 0.5 M(f - fc)