Consider the following ER diagram: The Qualification relationship is…

Consider the following ER diagram:

ER diagram in which Person and Exam participate in the many-to-many Qualification relationship; Qualification has the attribute QualifiedDate.

The Qualification relationship is many-to-many (M:N). Which of the following possible relations will not hold if the ERD is mapped into a relational model?

  1. A.

    Person (NID, Name)

  2. B.

    Qualification (NID, ExamID, QualifiedDate)

  3. C.

    Exam (ExamID, NID, ExamName)

  4. D.

    Exam (ExamID, ExamName)

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