Which of the following statements is not true?Ⅰ.The discounted payback period method involves comparing the net cost of the investment project with the net present value of the future cash flows expected to be generated by the project.Ⅱ.The shorter the payback period, the shorter the firm is exposed to risking the loss of its invested funds. Ⅲ.The average accounting return is the average project earnings after taxes and depreciation, divided by the average book value of the investment during its life. Ⅳ. Average accounting return takes no account of timing.