If the net cash flows for a project change signs more than once

a. The project should never be accepted

b. The project may have more than one IRR; the highest IRR should be used to determine whether to accept the project

c. The project may have more than one IRR; the NPV method should be used to determine whether to accept the project

d. All projects should be ranked according to their payback period to determine which project should be accepted

e. There is no concern because the IRR method works perfectly well with multiple changes in sign for the project cash flows