3. An ad campaign for a trip to Greece will be conducted in a limited geographical area and can use TV time, radio time, newspaper ads, and magazine ads. Information about each medium is shown below.MediumCost Per AdNumber ReachedTV850012000Radio18004000Newspaper24005500Magazine22004500The number of TV ads cannot be more than 4. Each of the media must have at least two ads. The total number of Magazine ads and Newspaper ads must be more than the total number of Radio ads and TV ads. There must be at least a total of 12 ads. The advertising budget is $50,000. The objective is to maximize the total number reached.Formulate a linear programming model for the above situation by determining(a) The decision variables (b) Determine the objective function. What does it represent?(c) Determine all the constraints. Briefly describe what each constraint represents.Note: Do NOT solve the problem after formulating.