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Which set of attributes can be chosen as a key when we consider a student can take the same course multiple times? A combination of

Which set of attributes can be chosen as a key when we consider a student can take the same course multiple times?
A combination of student id and semester
A combination of student id, course id, semester, and GPA
A combination of student id, course id, and semester
A combination of student id and course id
A combination of course id and semester
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