Which of the following statements is true about the function f(x) = x' - 6x²? a. The graph of f is concave upward on (-2, co). b. None of these. c. The graph of f is concave upward on (-o, -2). O d. The graph of f is concave upward on (-0o, 2). e. The graph of f is concave upward on (2, co).

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