I'm working on the class diagram for library management system and need help in defining the relationships between the following classes - person, member, librarian and account.
In my solution, I kept it as: Person has an Account instance Member and Librarian extends Person
But, when I referred to other solutions available on internet and famous interview preparing courses, it is modelled as follows: Account has a Person instance Member and Librarian extends Account
Can you please help with what advantage does the second one gives over first? What should be the correct way to go forward?
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