Find the Focus and Directrix of the Parabola $- \frac { 1 } { 28 } x ^ { 2 } = y$

Multiple Choice

Find the focus and directrix of the parabola.
- $- \frac { 1 } { 28 } x ^ { 2 } = y$

A) (0, -7) ; y = 7
B) (-14, 0) ; x = 7
C) (0, 7) ; y = -7
D) (0, -7) ; y = -7