Suppose f(x) and f'(x) are defined in an open interval (a, b), where a and b are critical numbers of f(x). When is the graph of f(x) increasing, in this particular interval? A) When f'(X) is negative for all values of x between a and b. When f(x) is negative for all values of x between a and b. (c) When f(x) is positive for all values of x between a and b. D When f(x) is positive for all values of x between a and b.

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