Find the Standard Form of the Equation of the Parabola $\text { Directrix: } y = 3$

Multiple Choice

Find the standard form of the equation of the parabola with the given characteristic and vertex at the origin. $\text { Directrix: } y = 3$

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