For a Binary Many-To-Many Relationship Existing Between Entity Types a and B

question 45

Multiple Choice

For a binary many-to-many relationship existing between entity types A and B:

• A) a separate relation C is created; the primary key of relation C is a composite key consisting of the primary key for each of the two entities in the relationship.
• B) the primary keys of relation A and relation B become foreign keys in a new relation C.
• C) secondary keys are used to establish the relationship.
• D) place the primary key of either entity in the relation for the other entity or do this for both entities.
• E) none of the above.

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