The correct answer is C. Master file.
A master file is a file that contains permanent data that is used by a computer system. It is typically updated periodically, but it is not erased or replaced. Examples of master files include customer files, inventory files, and employee files.
A specialized file is a file that contains data that is used for a specific purpose. It is typically not updated as frequently as a master file, and it may be erased or replaced when it is no longer needed. Examples of specialized files include temporary files, backup files, and audit files.
A log file is a file that records changes that are made to a computer system. It is typically used to track errors and to troubleshoot problems.
An update file is a file that contains changes that are made to a master file. It is typically used to update the master file without having to erase or replace it.
E is not the correct answer because it is not a type of computer file.