Consider the following statement concerning a linear programming model for minimizing total transportation cost in a logistic network: I) There are constrains on the unit transportation costs ii) the objective function is a measure of ordering costs III) Constrains enforce supply limits and also ensure that demand is satisfied at each customer location Which is (are) true? A) Statement I and II B) Statement II and III C) Statement III D) Statement I, II, and III E) None of the statement is true.