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A normal is drawn at a point P(x,y) of a...

A normal is drawn at a point `P(x,y)` of a curve. It meets the x-axis at `Q` such that `PQ` is of constant length `k`. Answer the question:The differential equation describing such a curve is (A) `y dy/dx=+-sqrt(k^2-x^2)` (B) `x dy/dx=+-sqrt(k^2-x^2)` (C) `y dy/dx=+-sqrt(k^2-y^2)` (D) `x dy/dx=+-sqrt(k^2-y^2)`

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