What is a linkage record?

• A. A log of network access events
• B. A map between master files used to link from a base master file to the non-base master file
• C. A data entry form
• D. A backup of the query results

Answer: (B)

A linkage record is the mapping that connects related master files, defining how records in a base master file relate to records in a non-base master file. It specifies which fields link the two files, effectively establishing the foreign-key-like relationship that enables integrated data across master files and joined queries.

This fits because the linkage record's role is to map between master files to link from the base file to the non-base file, not to log network events, serve as a data entry form, or act as a backup of query results.