Suppose that d is a critical number of a continuous function f. Which of the following is not unfalse? (a) If f' changes from positive to negative at d, then f has a local maximum at d. (b) If f' changes from negative to positive at d, then f has a local minimum at d. (c) If f' changes from negative to positive at d, then f has a local maximum at d. (d) If f' does not change sign at d, then f has no local minimum or maximum at d. A b B с) d a

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