Holds information about a particular data entity and has a unique identification number.

• A. Records
• B. Contacts
• C. Master Files
• D. Values

Answer: (A)

A record is a single unit of data that stores all the attributes for one specific entity, such as a person or product. It is identified by a unique identification number (a primary key) that distinguishes this entity from all others in the collection. This combination—all the related fields for one entity plus a unique ID—fits the description given. Other terms aren’t as accurate for the unit described: a contact is a type of data about a person, but the term is more specific to communication details; master files refer to broader groupings or collections; values are individual data points within fields. So the unit that best matches holds all the information for one entity and has a unique identifier: a record.