The Marketing Department is deciding which classes to offer over the summer. The classes under consideration are: Course Introduction to Marketing Retail Marketing Management Marketing High Technology Business Logistics International Marketing Marketing Research They are using an optimization model to determine which ses to offer. They have already formulated the objective function and need your help with the constraints. (a) Define binary decision variables to use to make the following constraints. Formulate the following constraints: (b) They would like to offer exactly 4 classes. Type Required Elective Required Elective Elective Required (c) They want to offer at least one required classes. (d) They want to offer at most two electives. (e) The same professor teaches both Retail Marketing Management and Marketing High Technology, so they can't offer both courses. (f) If they offer Marketing Research, they must also offer International Marketing.