For a Unary M:N Relationship

question 16

Multiple Choice

For a unary M:N relationship:

• A)the entity type is modeled as one relation;using as its primary key a composite key,a separate relation is created to represent the M:N relationship
• B)the entity type and the M:N relationship are modeled as one relation;a composite key is used
• C)separate relations for the class and for each subclass are created;primary and foreign keys are established for each class
• D)the primary key of the entity on the one side of the relationship serves as a foreign key in the relation on the many side of the relationship

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