(a) Modify the original formulation to account for the policy restriction that there must be one plant in either Detroit or Toledo, but not both. new constraint (y1, y2, y3, y4) = Place xij in row i column j. value = (b) Modify the original formulation to account for the policy restriction that no more than two plants can be located in Denver, Kansas City, and St. Louis. new constraint (y1, y2, y3, y4) = Place xij in row i column j. value =