Four point sources each of frequency (f) are fixed at their position as shown in the figure. An observer moving with constant velocity $V$ is crossing origin. ' N ' is number of different frequencies observed by the observer at the moment when it is crossing origin.

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(A) f 1 > f f 2 = f 4 = f f 3 < f (B) f 1 = f 2 > f f 3 = f 4 < f (C) f 1 = f 2 = f 3 = f 4 (D) f 1 = f 2 > f

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