A project should be accepted if $$

its internal rate of return $($IRR$)$ exceeds the firm's required rate of refurn

it yields multiple internal rates of return

in addition to cash inflows, the project genentes multiple cash outflows during its life

the sum of its mw $($undiscounted$)$ cash inflows is greater than the sum of the present value of its cash outflows

its traditional payback period is greater than the expected number of years to recover the original investment