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Tangents drawn from the point A(-4, 8) t...

Tangents drawn from the point `A(-4, 8)` to the parabola `y^2 = 16x` meet the parabola at `P and Q`. Then locus of the centre of the circle described on `PQ` as diameter is : (A) `x^2 = -2a(y-a)` (B) `y^2 = -2a(x-a)` (C) `x^2 = 2a (y-a)` (D) `y^2 = 2a(x-a)`

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