Write an Equation for the Parabola with Vertex at the Origin

Multiple Choice

Write an equation for the parabola with vertex at the origin.
-Focus (0, 10)

A) $x ^ { 2 } = 10 y$
B) $y ^ { 2 } = 10 x$
C) $x ^ { 2 } = 40 y$
D) $y ^ { 2 } = 40 x$