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What is the equation written in vertex form of a parabola with a vertex of (9, −1) that passes through (7, 7)? A. y = 2(x − 9)2 − 1 B. y = 2(x + 1)2 − 9 C. y = 2(x − 7)2 + 7 D. y = 7(x − 9)2 − 1