y = f'(x) 27. The graph of f', the derivative of the function f, is shown in the figure above. Which of the following statements must be true? I. fis continuous on the open interval (a, b). II. fis decreasing on the open interval (a, b). III. The graph of f is concave down on the open interval (a, b). (A) Ionly (B) I and II only (C) I and III only (D) II and III only

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