1. what are the differences between requirements and system requirements? 2. What is the difference between goal and requirement? 3. The requirements document is used by system customers, managers, system engineers, system test engineers, and system maintenance engineers. Explain how do they use it + What are the advantages and disadvantages of using the following methods to write system requirements: natural language, structured natural language design description language, graphical notations, and mathematical specifications? S. From your point of view, what are the functional and non-functional requirements of WhatsApp application. 6. Based on your experience in University of Hafr AlBatin, draw the use cases diagram of the Students Information System (SIS. Include the following actors in your diagram: student, Instructor, head of department, dean, and registrat