Draw the use case diagrams for the following cases, using any UML drawing tool (20 marks)

1. The system is : Library, one actor is the Member and one actor is the Librarian. A typical use case is Borrow a book
2. Use case diagram for a student to Register Course. There may be a Special Class registration, which is for non-standard students, in unusual time, with special topics, requiring extra fees etc.
3. Use the following registration system:

Professors indicate which courses they will teach on-line. A course catalog can be printed by student and registrar. Students can select on-line courses for upcoming semester. When the registration is completed, the system sends information to the billing system. Professors can also obtain course rosters on-line. Students can also add or drop classes on-line.

4. Create use case diagram for Vending Machine. A customer buys a product. The supplier restocks the machine. The supplier may collect money from the machine. The three actors that can be identified are Customer; Supplier; Collector (in this case Collector=Supplier)