9. (1 point) Please choose the MOST correct alternative. a. If the discount rate used for a project with normal cash flows is equal to its IRR, then the PI=1. b. The NPV of a project is equal to zero when the discount rate used is the IRR. c. For a project with normal cash flows, the PI will always be greater than 1 if the NPV is positive. d. The decision regarding acceptance / rejection of a project should be based on the NPV criterion. e. All of the above are correct