Using second derivative test for the critical points of the curve y = x³ - 3x2 9x + 20 , which of the following statements is true? A At x = 3,y" is positive, concave upward, hence, y (3) is a relative maximum value. B At x= -1, y" is negative, concave downward, hence, y (-1) is a relative maximum value. © At x= -1, y" is negative, concave downward, hence, y (-1) is a relative minimum value. D At x = 3, y" is positive, concave downward, hence, y (3) is a relative minimum value.

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