If the points $(0,4)$ and $(0,2)$ are respectively the vertex and focus of a parabola,then find the equation of the parabola.

Question

$\begin{array}{1 1}x^2+8y-32=0\\x^2-8y+32=0\\x^2+4y+32=0\\x^2-4y+32=0\end{array} $