Dec 9th - part 2 DR E O O File Onboat F20629 A Real del Draw Ho e. All of the above have a feasible region. 3. Let Xi = 1 if Project i is selected, i = 1,2,3,4,5; and 0 otherwise: Which answer below indicates that if Project 2 is selected, then Project 5 must also be selected? a. X2 + X5 = 1 b. Xs - X; = 15 and X - Y = 5 and X >= 10 C. X >= 10 and Y>= 20 d. X+Y>= 100 and X + Y