If \( f(x+a y, x-a y)=a x y \) then \( f(x, y) \) is equal to \( \m...

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If \( f(x+a y, x-a y)=a x y \) then \( f(x, y) \) is equal to
\( \mathrm{P} \)
(a) \( x y \)
(b) \( x^{2}-a^{2} y^{2} \)
W)
(c) \( \frac{x^{2}-y^{2}}{4} \)
(d) \( \frac{x^{2}-y^{2}}{a^{2}} \)
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