Question 4: The system gives professionals a platform where they can make their professional social profile and get themselves recognized in their field of work. This system will allow them to get online job hiring requests. System will help professionals to have informational technical discussions online and will also provide an area where they can be the part of their professional community and can sharing their personal professional experiences, thoughts, can have general talks, share new research by posting into community panel. Identify the classes and draw class diagram with suitable relationships, multiplicities, and roles