Kazapeeee is an online shopping system with a web-based and Android mobile-based application. It consists of its website and requires an Android operating system (OS) device to download the application for the application to work. The KzP involves two-way communication between the seller and the buyer in this application. The KzP is an ideal second-hand online shopping system targeting university students around Cyberjaya. Through this application, new students can purchase items such as study materials, basic needs and places to stay in a cheaper price range. Through this application, it can ease the student's burden by purchasing an item within their budget. Moreover, it can also help the graduates and lecturers by selling their old notes to the newer students that join their respective universities. This application can also function for students with a lower income and no transportation to have a better university life. Other capable students can offer part-time jobs and transportation for those in need.

a) Illustrate the Use Case diagram.

b) Based on your answer in (a), choose any TWO (2) use cases and illustrate the TWO (2) sequence diagrams.