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Which of the following describes something in a database that refers to the unique identifier in the parent table?

  1. Process

  2. Attribute

  3. Server

  4. Input

The correct answer is: Attribute

An attribute is a characteristics or property of a data entity, which can act as a unique identifier in a database. This differs from the other options as "process" refers to a series of actions, "server" is a computer or device that provides services to other devices, and "input" is data that is entered into a computer. These options do not describe a unique identifier within a database.