Give the Focus, Directrix, and Axis for the Parabola $34 \mathrm {~m}$

Multiple Choice

Give the focus, directrix, and axis for the parabola.
-A tunnel is in the shape of a parabola. The maximum height is $34 \mathrm {~m}$ and it is $17 \mathrm {~m}$ wide at the base. What is the vertical clearance $6 \mathrm {~m}$ from the edge of the tunnel?

A) $1.3 \mathrm {~m}$
B) $32.7 \mathrm {~m}$
C) $31.1 \mathrm {~m}$
D) $2.9 \mathrm {~m}$