Case Study: On the Spot Courier Services

1. Customer: The entity in charge of ordering services

2. Courier: A business that handles orders and provides delivery services.

3. Order: An item that represents a customer's request for a courier service.

4. Delivery: A simulation of an order's actual delivery.

5. Payment: An item that represents the payments associated with an order.

List at least five tables corresponding to the domain model classes above. Include the following information for each of the tables: primary key, foreign keys to other tables, and other attributes that you think is needed to characterize the class. Also include whether or not the table is in third normal form or not - and why.