Find the Standard Form of the Equation of the Parabola $x ^ { 2 } = - 12 y$

Multiple Choice

Find the standard form of the equation of the parabola with the given characteristic(s) and vertex at the origin.
Directrix: x = 3

A) $x ^ { 2 } = - 12 y$
B) $y ^ { 2 } = 12 x$
C) $y ^ { 2 } = \frac { x } { 12 }$
D) $x ^ { 2 } = 12 y$
E) $y ^ { 2 } = - 12 x$