ABC Company sells original manuscripts of Broadway plays. \\( A B C \\) pays for all its purchases in full with one check. It allows customers to make installment payments on sales that exceed \\( \\$ 33,000 \\). However, a customer cannot make another purchase until all prior purchases have been paid for. The REA diagram for \\( A B C \\) company depicts seven Employee entities, each labeled for the role played by that type of employee (e.g., cashier, salesperson, shipping clerk, accountant, etc.). The REA diagram also contains two resource entities (Inventory and Cash) and the following events: Purchases, Disburse Cash, Sales, and Receive Cash. The REA diagram also contains two instances of the Customer entity and three instances of the Supplier entity. Implementing the integrated REA diagram for the revenue and expenditure cycles of the \\( A B C \\) company in a relational database requires how many tables? 18 9 15