Recall the Martin-Beck Company distribution system problem in Section 11.3.
a. Modify the formulation shown in Section 11.3 to account for the policy restriction that one plant, but not two, must be located either in Detroit or in Toledo.
b. Modify the formulation shown in Section 11.3 to account for the policy restriction that no more than two plants can be located in Denver, Kansas City, and St. Louis.