The vertex of this parabola is at (5, - 4). Which of the following could be its equation?

A.

y = 2 (x - 5) 2 - 4

B.

y = 2 (x + 5) 2 - 4

C.

y = 2 (x + 5) 2 + 4

D.

y = 2 (x - 5) 2 + 4

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