Let \( A \) and \( B \) be two distinct points on the parabola \( y^{2} \) \( =4 x \). If the ax....

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Let \( A \) and \( B \) be two distinct points on the parabola \( y^{2} \) \( =4 x \). If the axis of the parabola touches a circle of radius \( \mathrm{r} \) and \( A B \) is its diameter, then the slope of the
\( \mathrm{P} \)
line \( A B \) is:
(1) \( \frac{-1}{r} \)
(2) \( \frac{1}{r} \)
(3) \( \frac{2}{r} \)
(4) \( \frac{-2}{r} \)



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