Question 5 If a side constraint for a network flow model cannot be avoided, and non-integer solutions result, how can the solution be expressed as an integer solution? O Increase the supply until the solutions are all integer using a dummy supply node. O Round off all the non-integer arc flow decision variables. O Increase the demand until the solutions are all integer using a dummy demand node. O Force all the arc flow decision variables to be integer.Question 6 One approach to solving integer programming problems is to ignore the integrality conditions and solve the problem with continuous decision variables. This is referred to 25: O quickest solution method. O LP approximation. O LP relaxation. O LP satisficing.Question 7 The objective function value for the ILP problem can never: O be as good as the optimal solution to its LP relaxation. O be worse than the optimal solution to its LP relaxation. O be as poor as the optimal solution to its LP relaxation. O be better than the optimal solution to its LP relaxation