105 Assignment 3 1. Draw a use case diagram for the Train Ticket Distributer system that you wrote its functional and non-functional requirements in Assignment 2, such that: The system includes two actors: a traveler who purchases different types of tickets, and a central computer system that maintains a reference database for the tariff. Use cases should include BuyOne Way Ticket, Buy WeeklyCard, BuyMonthlyCard, and Update Tariff. - Also include the following exceptional cases: TimeOut (i.e., traveler took too long to insert the right amount), TransactionAborted (i.e., traveler selected the cancel button without completing the transaction), DistributorOutOfChange, and DistributorOutOfPaper. 2. Describe the use case textually with consideration to the guidelines used for writing use cases. Show the used guidelines in a separate section. 3. Refine the use case (highlight the added details using blue color)