Part a. What is an activity diagram and what does it show? How does it relate to usecases?

Part b. What does a class diagram show?

Part c. If you are going to work with an existing object oriented application with many classes, how would you use the class diagram?

Part d. What does a sequence diagram show?

Part e. If you are going to work with an existing object oriented application with many classes and methods, how would you use the sequence diagram along with class diagram?