In which two cases it is not advisable to rely on the internal rate of return when deciding on projects: A. In the case when the NPV is positive and the IRR is higher than the required rate of return. B. In the case when the average accounting return is negative and the NPV is positive. C. In the case of mutually exclusive project and non-conventional cash flow stream. D. In the case of mutually exclusive projects and conventional cash flow stream. E. In the case when the NPV is positive and the profitability index is greater than one.