A) NPV and IRR: Under which circumstances can the NPV and IRR calculations lead to conflicting results? B) Differences: What is the major reason for the difference? C) Preferable Methods: Which of the two methods is preferable? Why? Use examples and plots with your posting where appropriate. Be sure to consider the optimality rule in your response. Use sub-headings to organize your answers. Cite any references you use in your answer, at the bottom of your posting.