In a capital budgeting problem, if either project 1 or project 2 is selected, then project 5 cannot be selected. Which of the alternatives listed below correctly models this situation? Question 7 options: 1) x1 + x2 + x5 1 2) x1 + x2 + x5 1 3) x1 + x5 1, x2 + x5 1 4) x1 - x5 1, x2 - x5 1 5) x1 - x5 = 0, x2 - x5 = 0