1. The Fourier transform of product of two time functions [f1(t)f2(t)] is given by :
(a) [f1(ω) + f2(ω)]
(b) [f1(ω) / f2(ω)]
(c) [f1(ω) * f2(ω)]
(d) [f1(ω) x f2(ω)]
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