If a project has a nonnormal cash flow pattern, you should use NPV as your decision tool because IRR will provide multiple answers. O use IRR as your decision tool because NPV will be negative. use the profitability index because both NPV and IRR will provide multiple answers, O use payback as your decision tool because it is most important to know how long unti recoup your investment. O use either NPV or IRR as long as it is an independent project under consideration