If \( P, \mathrm{Q} \) and \( R \) are three points on the parabola \( y^{2}=4 a x \) at which t....

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If \( P, \mathrm{Q} \) and \( R \) are three points on the parabola
\( \mathrm{P} \)
\( y^{2}=4 a x \) at which the normal intersect at the point \( (h \), \( k) \), then the centroid of \( \triangle P Q R \) is
W
(1) \( \frac{1}{3}(h-2 a, 0) \)
(2) \( \frac{4}{3}(h-2 a, 0) \)
(3) \( \frac{2}{3}(h-2 a, 0) \)
(4) \( \left(\frac{2 a-h}{3}, 0\right) \)



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