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A source of sound \( \mathrm{S} \) having frequency \( \mathrm{f} \). Wind is blowing from source to observer \( \mathrm{O} \) with velocity \( \mathrm{u} \). If speed of sound with respect to air is \( \mathrm{C} \), the wavelength of sound detected by \( \mathrm{O} \) is:
\( \mathrm{P} \)
(A) \( \frac{\mathrm{C}+\mathrm{u}}{\mathrm{f}} \)
(B) \( \frac{\mathrm{C}-\mathrm{u}}{\mathrm{f}} \)
(C) \( \frac{C(C+u)}{(C-u) f} \)
(D) \( \frac{C}{f} \)
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