Let Q be the vertex and Q be any point on the parabola $x^2=8y$ . If the piont P divides the line segment OQ internally in the ratio $1:3$ then the locus of P is :

Question

$\begin{array}{1 1} y^2=x \\ y^2= 2x \\ x^2 = 2x \\ x^2 =y \end{array}$