JJ Flyers makes and sells fly fishing rods, custom$-$designed and manufactured specifically for each customer. Many customers are repeat purchasers.

The rods are expensive, each one is unique, and a down payment is required when an order is placed. The balance of the payment must be made in full when the customer takes delivery.

JJ has a number of commissioned sales representatives. When a sales rep receives an order, a customer record is created. It is used for repeat orders and to track repairs. The rep processes the customer payment $($check or credit card$)$ and deposits the receipt in the company$$s bank account, updating the customer record to reflect receipt.

Prepare a UML Class diagram using the REA framework $($Chapter $5,$ Appendix A$)$ to model the sales process. Use the following tables:

Resources: Rod inventory, Customer Record

Events: Sale, Payment Receipt

Agents: Sales Representative, Customer

For each table, suggest appropriate attributes, and indicate Primary and Foreign Keys.

Multiplicities:

A: JJ will only sell one rod to a customer at a time.

B: Each rod is unique and can only be sold once.

C: A sales rep may not have any sales transactions $($yet$)$ but the good ones have many sales transactions.

D: Only one sales rep deals with each customer.

E: JJ has repeat customers. Customer records are set up for the first purchase.

F: each sale involves only one customer.

G: Each payment receipt updates only one customer record.

H: Each customer record must indicate at least one $($down payment$)$ receipt or could show many receipts.

I: Each customer must pay a deposit and pay in full for the prior order before they can place another order which must also be accompanied by a deposit.

J: Each sales rep only processes receipts from their own customers. They may have processed zero receipts $($no sales yet$)$ or many.

K: Each receipt is processed by only one sales rep.

L: Each payment receipt is for one and only one sales transaction.

M: Each sale must have at least one receipt $($the deposit$)$ and at most two receipts for each sale.