Which Of The Following Is True About Identifiers Of Entities?

(Correct Answer Below)

Which Of The Following Is True About Identifiers Of Entities?

A) Identifiers must be unique. B) Identifiers are not normally used in a naming role. C) The value of an identifier may identify a set of entity instances. D) Identifiers may not be more than two attributes. E) An identifier in the E-R model is equivalent to a key in the relational model.
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C) The value of an identifier may identify a set of entity instances.

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