Which of the Following Specifies That Each Instance of an Entity

question 42

Multiple Choice

Which of the following specifies that each instance of an entity type must have a unique identifier that is not null?

• A)referential integrity constraints
• B)triggering operations
• C)entity integrity
• D)domains

---

Definitions:

Genius Bar

A tech support station located inside Apple's retail stores, where customers can receive advice, diagnostics, and repairs for their Apple products.

Apple Retail Stores

Official retail outlets owned and operated by Apple Inc., specializing in the sale and support of Apple products and services.

Highly Trained Personnel

Employees who have undergone extensive training and possess specialized skills or knowledge, contributing to a company's competitive advantage.

Postsale Services

Support activities provided by a company after a product has been sold, including installation, maintenance, repair, and customer assistance.