Which one of the following statements is correct? Assume cash flows are conventional.

a. If two projects are mutually exclusive, you should select the project with the shortest payback period.

b. Projects with conventional cash flows have multiple internal rates of return.

c. The profitability index will be greater than 1.0 when the net present value is negative.

d. When the internal rate of return is greater than the required return, the net present value is positive. e

e. If the IRR exceeds the required return, the profitability index will be less than 1.0.