The correct answer is D. Virus protection.
An operating system (OS) is a software program that manages computer hardware and software resources and provides a platform for running application programs. Operating systems perform basic tasks, such as managing the file system, memory, processes, and input/output devices.
Memory management is the process of allocating and de-allocating memory to programs and processes. Disk management is the process of managing disk space, including formatting, partitioning, and file allocation. Application management is the process of installing, uninstalling, and managing applications. Virus protection is the process of detecting and removing viruses and other malware.
Of the above options, only virus protection is not a function of the operating system. The operating system may provide some virus protection features, but it is not the primary responsibility of the operating system to protect against viruses.
