3. UML Sequence diagram 
 A - Consider the following flow of event of a use case :
 Process Sale Scenario : 
1. Cashier starts new sale
 2. Cashier enters item identifier 
3. System records sale line item and presents item description, price and running total Steps 2 and 3 are repeated until all items are processed. 
4. System presents total with taxes calculated 
5. Cashier tells Customer the total and asks for payment
 6. Customer pays and System handles payment • 
Question : Draw a sequence diagram of the above scenario