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Let \( P \) be a variable point. From \( P \) tangents \( P Q \) and
P \( P R \) are drawn to the circle \( x^{2}+y^{2}=b^{2} \). If \( Q R \) is

W always touching the parabola \( y^{2}=4 a x \), then locus of \( P \) is:
(1) \( a y^{2}=b^{2} x \)
(2) \( a y^{2}=-b^{2} x \)
(3) \( a^{2} y=b x^{2} \)
(4) \( a^{2} y=-b x^{2} \)
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