11. A candidate key must uniquely identify each row.

A. True
B. False

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12. Well-structured relations encourage anomalies of data.

A. True
B. False

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13. A foreign key may be null and still adhere to the referential integrity constraint.

A. True
B. False

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14. If a relation is in third normal form, it does not need to be in second normal form.

A. True
B. False

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15. The primary key of the new relation in a many-to-many relationship is a composite key comprised of the primary keys of each of the binary entities.

A. True
B. False

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