A candidate key that has been selected as the unique, identifying characteristic for an entity type is called a:

A candidate key that has been selected as the unique, identifying characteristic for an entity type is called a:

A candidate key that has been selected as the unique, identifying characteristic for an entity type is called a: 



A. attribute.
B. identifier.
C. secondary key.
D. gerund.
E. index.



Answer: B


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