Which of the Following Is True About Identifiers of Entities

question 77

Multiple Choice

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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Definitions:

Noncontroversial

Descriptive of topics or issues that do not provoke public disagreement or dispute.

Repeat Business

The continuous engagement of customers with a business, resulting in them purchasing products or services more than once.

Discounts

Reductions applied to the regular price of goods or services, often used as a sales promotion strategy.

Free Merchandise

Products offered at no cost, typically as part of a promotional effort to attract attention or goodwill.