5. In LP, objective function coefficients could change due to: (3 Marks) a. changes in the alternative optimal solutions b. changes in the customers' preferences c. changes in the marketing expenses d. changes in the resources amount needed to produce the product 6. Northwest corner rule is a: (3 Marks) a. method through which optimal solution for a transportation problem can be found b. method through which feasible solution for a transportation problem can be found c. method through which alternative optimal solutions for different problems can be found d. method through which one optimal solution for different problems can be found 7. Unbalanced transportation problem occurs when: (3 Marks) a. we add one dummy warehouse b. we add one dummy plant c. Supply is not equal to demand d. none of the above is true 8. Stepping-Stone method helps manager: (4 Marks) a. finds the optimal solution for a transportation problem b. develops initial feasible solution c. finds the appropriate raw materials for production d. none of the above is true