20. Consider the UML diagram below. It shows (1) a client class (Advisor), (2) a superclass (Student) used by the client (Advisor), and (3) a child class (UndergradStudent) of the Student class. What do you have to change in each of the three classes if you change the following: The public behavior of the Student Class by changing their access designators. Assume the public behavior of the Student Class was used by the Advisor class and the UndergradStudent class before the Student class was changed and the changes you now make will ensure that all three classes will continue to work after your added changes. Advisor Student UndergraduateStudent

7. With reference to Figure 3.14, what is the difference between the two diagrams? Choose only one option. (a) In Diagram 1, color is public but in Diagram 2 color is private. (b) Diagram 2 indicates that the car's color can be removed and replaced. (c) Diagram 1 shows an abstract class and Diagram 2 shows a concrete class. (d) None, they mean the same thing. Car color Car Color color: Color 1 Diagram 1 Diagram 2

From the following UML class diagram, compute the coupling factor (CF) for each class? What is the average CF of the entire system? [Hints: Do not count inheritance-based relationships]