What is system sequence diagram for the main flow of the use case of Figure 5.2, choosing one of the following strategies: stateless or stateful.

Use case 02: Pay order 1. The system generates the pending order summary (title, author, quantity, unit price, and subtotal for each book), as well as the total price of the order, and a list of registered delivery addresses for the customer. 2. The customer selects a delivery address. 3. The system presents the delivery fee, the scheduled arrival date, and a list of credit cards already registered for the customer (flag and last four digits of the credit card number). 4. The customer selects one of her credit cards for payment. 5. The system sends to the respective credit card operator the following data: card number, owner's name, validity, security code, total purchase value, and code of the store. 6. The credit card operator approves the sale by sending an authorization code. 7. The system informs the customer that the sale was approved and supplies the tracking number of the package. Use case 02: Pay order 1. The system generates the pending order summary (title, author, quantity, unit price, and subtotal for each book), as well as the total price of the order, and a list of registered delivery addresses for the customer. 2. The customer selects a delivery address. 3. The system presents the delivery fee, the scheduled arrival date, and a list of credit cards already registered for the customer (flag and last four digits of the credit card number). 4. The customer selects one of her credit cards for payment. 5. The system sends to the respective credit card operator the following data: card number, owner's name, validity, security code, total purchase value, and code of the store. 6. The credit card operator approves the sale by sending an authorization code. 7. The system informs the customer that the sale was approved and supplies the tracking number of the package