<Li> Revision control utilities can recreate a coherent structure where multiple users simultaneously modify the same file . </Li> <Li> Disk cleaners find files that are unnecessary to computer operation, or take up considerable amounts of space . Disk cleaner helps the user to decide what to delete when their hard disk is full . </Li> <Li> File managers provide a convenient method of performing routine data management, email recovery and management tasks, such as deleting, renaming, cataloging, uncataloging, moving, copying, merging, generating and modifying folders and data sets . </Li> <Ul> <Li> Data generators create a file of test data according to specified patterns . </Li> <Li> Hex editors directly modify the text or data of a file . These files can be data or an actual program . </Li> <Li> HTML checkers validate HTML code and check links . </Li> <Li> Sort / Merge programs arrange records (lines) in a file into a specified sequence . </Li> </Ul>

Which of the following is not one of the common types of utility programs ​