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A distributed, multi-tiered Online Examination System consists of presentation, application, and database layers, where different users interact through well-defined role-based permissions. The class diagram models the structural relationships among system entities while enforcing administrative boundaries and runtime assessment constraints. The major actors include System Administrator, Institution Administrator, Faculty (Examiner), Student, Proctor, and Evaluation Service, each with specific responsibilities. At the highest level, an abstract class User contains common attributes such as *userId, name, email, password, status,* and operations including *login(), logout(), and updateProfile()*. The classes SystemAdministrator, InstitutionAdministrator, Faculty, Student, and Proctor inherit from the User class through generalization. _________ ____ __________ _______ ______ _____ __________ ___.
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