Let P,Q,R be three points on a parabola, normals at which are concurrent, the centroid of `Delta PQR` must lie on

Let P,Q,R be three points on a parabola y^2=4ax , normals at which are concurrent. The centroid of the ΔPQR must lie on

The normals at three points P,Q,R of the parabola y^2=4ax meet in (h,k) The centroid of triangle PQR lies on

The normals at three points P,Q,R of the parabola y^2=4ax meet in (h,k) The centroid of triangle PQR lies on (A) x=0 (B) y=0 (C) x=-a (D) y=a

The normals at three points P,Q,R of the parabola y^(2)=4ax meet in (h,k) The centroid of triangle PQR lies on (A)x=0(B)y=0(C)x=a(D)y=a^(*)