Find an Equation of the Parabola Described $y = - \frac { 1 } { 12 } x ^ { 2 }$

Multiple Choice

Find an equation of the parabola described.
-Directrix the line y = 3; vertex at (0, 0)

A) $y = - \frac { 1 } { 12 } x ^ { 2 }$
B) $y = - 12 x ^ { 2 }$
C) $x = 3 y ^ { 2 }$
D) $x = - \frac { 1 } { 12 } y ^ { 2 }$