Which of the following statements are correct? I. A positive net present value signals an accept decision. II. Projects should be accepted when the profitability index is greater than 1 III. A payback period that is less than the required period signals an accept decision. IV. When the internal rate of return exceeds the required return, a project should be accepted. A.I, III, and IV only B. I, II, and III only C. I, II, III, and IV D. II, III, and IV only E. I and II only F. I and III only