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\( A \) and \( B \) are two points on the parabola \( y^{2}=4 a x \)
\( \mathrm{P} \) with vertex \( O \). If \( O A \) is perpendicular to \( O B \) and

W they have lengths \( r_{1} \) and \( r_{2} \), respectively, then the value of \( \frac{r_{1}^{4 / 3} r_{2}^{4 / 3}}{r_{1}^{2 / 3}+r_{2}^{2 / 3}} \) is:
(1) \( 16 a^{2} \)
(2) \( a^{2} \)
(3) \( 4 a \)
(4) None of these
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