Which of the following is NOT a part of file management in an operating system?

File management within an operating system encompasses various functions designed to efficiently organize and maintain files on a storage medium. Primarily, this includes file storage, which refers to how files are saved and where they reside on physical drives; file organization, which pertains to how the data within those files is structured to permit easy access and modification; and data compression, which is a technique used to reduce the size of files for more efficient storage and faster transmission.

Resource allocation, on the other hand, falls outside the realm of file management. It refers more broadly to how the operating system allocates physical and logical resources—such as CPU time, memory, and disk space—to various tasks and processes running on the system. While resource allocation is undoubtedly a crucial function of an operating system, it does not specifically pertain to how files are managed, stored, or organized. Thus, this is why resource allocation is the correct choice for the option that is not part of file management in an operating system.