The minimum value of \( a x+b y \), where \( x y=r^{2} \), is \( (r...

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The minimum value of \( a x+b y \), where \( x y=r^{2} \), is \( (r, a b0) \)
(A) \( 2 r \sqrt{\mathrm{ab}} \)
(B) \( 2 a b \sqrt{r} \)
\( \mathrm{P} \)
(C) \( -2 r \sqrt{a b} \)
(D) None of these
W)
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