-2 50 -50 The graph above displays the derivative of y = f(x) defined on the closed interval [-4,4]. The graph is exactly symmetric about the origin. Choose all the statements that are correct. (a) f(x) has a unique critical point at x = 0 where fattains its global maximum. (b) f(x) is quasiconcave. (c) f(x) is quasiconvex. (d) f(x) has an inflection point at x = 0. (e) f(x) attains its global minimum at x = 4.

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