Which of the following decisions involve differential analysis? The decision to close a segment of a business. The decision by a record store to add videotapes to its product line. The decision by a university to drop its intercollegiate football program. All of the above. Which of the following is incorrect regarding the payback period method? OThe payback period ignores the time period beyond the payback period. When using payback analysis for investment decisions, one rule is to select the shortest payback period investment. The formula for the payback period is: Payback period - Initial cash outlay/Annual amount of investment Payback analysis ignores the time value of money