Give the Focus, Directrix, and Axis for the Parabola $98 \mathrm { ft }$

Multiple Choice

Give the focus, directrix, and axis for the parabola.
-A building has an entry the shape of a parabolic arch $98 \mathrm { ft }$ high and $6 \mathrm { ft }$ wide at the base. Find an equation for the parabola if the vertex is put at the origin of the coordinate system.

A) $y ^ { 2 } = - 0.4 x$
B) $y ^ { 2 } = - 0.1 x$
C) $x ^ { 2 } = - 0.4 y$
D) $x ^ { 2 } = - 0.1 y$