Derive the Equation of a Parabola Practice Test

Which equation follows from the focus–directrix definition for the parabola with focus $F(2,1)$ and directrix $x=-2$ (opening to the right)?

A parabola is the set of points equidistant from focus $F(0,2)$ and the directrix $y=-2$ (opening upward). Which equation represents the parabola?