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Draw sequence diagram for Buy a book: A user wants to buy a book. In order...

Draw sequence diagram for

Buy a book: A user wants to buy a book. In order to do so, the buyerlogs into the system, selects the desired books, adds them to order, and checkouts. The system performs necessary activities, such as validating and confirming payment of the user, updating the stock level, and preparing to ship the items to the user.

2a. Describe at least one alternative sequence of interaction, and explain your reason for using the sequence that you have drawn in 2a instead of the alternatives.(0.75 marks)

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Another alternative is,if the book is unavailable we can show similar books.

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