Two vehicles, each moving with speed u on the samehorizontal straight road, are approaching each other. Wind blows along the road with velocity w. One of these vehicles blows a whistle of frequency $$f_1$$. An observerin the other vehicle hears the frequency of the whistle to be $$f_2$$. The speed of soundin still air is V. The correct statement(s) is (are)

A

If the wind blows from the observerto the source, $$f_2 > f_1$$.

B

If the wind blows from the source to the observer, $$f_2 > f_1$$.

C

If the wind blows from observerto the source, $$f_2 < f_1$$.

D

If the wind blows from the source to the observer, $$f_2 < f_1$$.