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A small source of sound moves on a circle as shown in the figure and an observer is standing on \( O \). Let \( f_{1}, f_{2} \) and \( f_{3} \)
\( \mathrm{P} \) be the frequencies heard when the source is at \( A, B \) and \( C \)

W respectively. Then
[UPSEAT 2002]
(a) \( f_{1}f_{2}f_{3} \)
(b) \( f_{2}f_{3}f_{1} \)
(c) \( f_{1}=f_{2}f_{3} \)
(d) \( f_{2}f_{1}f_{3} \)
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