Question 1: Model the below described system with use case diagram. (60 points) Online Purchasing System The system displays the items' list The customer selects an item The system verifies if the item is available, If the item is not available, the system displays the items' list again If the item is available customer pays the item using credit card or selects the option of on delivery payment If paid using credit card the system verifies credit card data with the bank server According to the bank response the system will weather display a confirmation message or a declined operation message Question 2: Specify the functional and nun-functional requirements. (40 points)