Find the Standard Form of the Equation of the Parabola $x ^ { 2 } = - 8 y$

Multiple Choice

Find the standard form of the equation of the parabola with the given characteristic(s) and vertex at the origin. ​
Directrix: y = 2
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A) $x ^ { 2 } = - 8 y$
B) $x ^ { 2 } = 8 y$
C) $y ^ { 2 } = - 8 x$
D) $y ^ { 2 } = 8 x$
E) $x ^ { 2 } = - \frac { y } { 8 }$