Let C be the curve defined by x? – y? = 1. Consider all points (x, y) on curve C where a > 1 and y > 0. Which of the following statements provides a justification for the concavity of the curve? The curve is concave down because y" = -エく0. The curve is concave up because y" = > 0. The curve is concave down because y" = く0. The curve is concave up because y" = > 0.

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