Find the Equation of the Parabola with Focus at $0,-8)$ And with Directrix

Multiple Choice

Find the equation of the parabola with focus at ( $0,-8)$ and with directrix $y=8$ .

A) $y^{2}=32 x$
B) $y^{2}=-32 x$
C) $x^{2}=-32 y$
D) $x^{2}=32 y$