Which of the following equations represents the parabola with vertex at (3, 2) and directrix y = 4?

a (x − 3)2 = −8(y − 2)

b (x + 3)2 = 8(y + 2)

c (y − 2)2 = −4(x − 3)

d (y + 2)2 = 4(x + 3)