Find the area of the triangle formed by the lines joining the vertex of the parabola $ x^2 = 12y $ to the ends of its latus rectum.

Question

$\begin {array} {1 1} (A)\;16\: sq.units & \quad (B)\;17\: sq.units \\ (C)\;18\: sq.units & \quad (D)\;19\: sq.units \end {array}$