Draw the use Case Diagram Draw use case diagrams for given case study

Case Study 1 Consider the online shopping case. The system provides the following functions: Web Customer uses some web site for online shopping. Registered Customer uses some web site to make purchases online. The Top level use cases are View Items, Make Purchase and Client Register. View Items use case could be used by new customers if they wants to find and see some products. This use case could also be used as a part of Make Purchase use case. Client Register use case allows customer to register on the web site, for example to get some coupons or be invited to private sales. Note, that Checkout use case is included use case not available by itself - checkout is part of making purchase