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Question of the Day for 2/22/2026

Subject: Object Oriented Analysis

BizByOrder Books is specialized in ordering books for two types of customers: individuals and businesses in lower Manhattan. This is how these two different customers are different. When an individual customer orders books, he or she has to pay 100% down payment. A business customer can establish a credit line with BizbyOrder and pays 50% down if and only if the order amount exceeds its credit limit. The bookstore orders its books through five national distributors. Because of various special agreements in the book industry, each publisher sells its books exclusively to one distributor. Each time when a customer comes, the bookstore uses its database system to find the title and locate the distributor. Then the cashier takes the order and a down payment (if needed) and send the order to a distributor. When an order arrives, the customer will be contacted to pick up and pay the rest of the balance. Which ones are use cases?

1. Serve customers
2. Order Books
3. Credit Line
4. Collect Payment
5. Locate Distributor
6. Search for Books
7. Setup Vendor Agreement

1, 3, 5, and 7
2, 4, and 6
2, 3, and 4
5, 6, and 7
all of them

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