The correct answer is Master file.There are numerous types of files used for storing data needed for processing, reference or back up. The main common types of processing files includeMaster files,Transaction,Reference,Backup, report andSort file.A master file is the main that contains relatively permanent records about particular items or entries. For example a customer file will contain details of a customer such as customer ID, name and contact address. ?Additional InformationRandom file: Random files are record-based files with an internal structure that supports "direct access" by record number.Transaction file: A transaction file is a data file in which transaction records are stored which relate to entries in a master file. Sequential file: A sequential file contains records organized by the order in which they were entered. The order of the records is fixed. Records in sequential files can be read or written only sequentially.