Determine the interval(s) over which the graph of y=x²-4x³ +7 is concave up or concave down. O a.) Concave up on (3,0) Concave down on (-∞,3)U(0,3) b.) Concave up on (-∞,2)U(2,00) c.) Concave up on (0,2) Concave down on (-∞,0)U(2,00) d.) Concave up on (-∞,0)U(2,00) Concave down on (0,2)

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