11. In a relation, the order of the columns does not matter.

A. True
B. False

12. A functional dependency is a relationship between or among attributes.

A. True
B. False

13. A key is a group of one or more attributes that uniquely identifies a row.

A. True
B. False

14. Keys made up of two or more attributes are called composite keys.

A. True
B. False

15. Given the functional dependency R → S , R is called the determinant.

A. True
B. False