Final answer:
Under the Privacy Act of 1974, a Federal agency must publish a System of Records Notice in the Federal Register when it maintains and retrieves individual's information by name or identifier, to inform the public and allow privacy rights to be exercised.
Step-by-step explanation:
The Privacy Act of 1974 mandates that a Federal agency must publish a System of Records Notice (SORN) in the Federal Register when it maintains information about an individual in a system of records and retrieves that information by the individual's name or any personal identifier. The purpose of this publication is to inform the public of the existence of the records system, the types of information contained therein, the agency's authority for maintaining the information, the routine uses for the records, and how an individual can go about exercising their privacy rights under the Act, such as accessing and correcting records.