Derive the equation of the parabola with a focus at (-5, 5) and a directrix of y = - 1.

A. f (x) = - 1/12 (x - 5) ^2 + 2

B. f (x) = 1/12 (x - 5) ^2 + 2

C. f (x) = - 1/12 (x + 5) ^2 + 2

D. f (x) = 1/12 (x + 5) ^2 + 2

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