The signal W(t) = X 1(t)X2(t) is sampled by a periodic impulse train. It is known that x1(t) is band limited to 1000pi and x2(t) is band limited to 3000pi. Which one of the followings is the most accurate constraint on sampling interval Ts such that w(t) can be recovered from its samples through the use of an ideal lowpass filter? Ts

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