Given the directrix of y = 4 and focus of (0, 2), which is the equation of the parabola?
A) y = 1/4 times x^2 + 3
B) y = -1/4 times x^2 + 3
C) y = 1/4 times x^2 - 3
D)y = -1/4 times x^2 - 3