Which of the following is the equation of a parabola with a directrix of y = 2 points -7 and a vertex at (2, -4).
A. y = -1/12(x - 2)^2 - 4
B. y = -1/12(x + 2)^2 - 4

C. y = 1/12(x + 2)^2- 4
D. y = 1/12(x - 2)^2- 4

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