What are intervals of concavity of the function f(x) = 2x - 6x² – 3 ? Concave upward on (1, o) and concave downward on (-o, 1). a. O b. Concave upward on (-co, 1) and concave downward on (1, 0). c. None of these. d. Concave upward on (-0o, -1) and concave downward on (-1, co). O e. Concave upward on (-1, co) and concave downward on (-o, -1).

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