Which is not a function of operating system?

Question

Accepted Answer

The correct option is (4):
The primary functions of a core operating system are to manage the computer's fundamental resources, and Virus protection is the one item on this list that is typically *not* an intrinsic part of the operating system kernel itself. The OS provides essential *security mechanisms* like user authentication, access control, and memory protection to safeguard the system. However, the specialized task of identifying, isolating, and neutralizing specific malicious code (viruses and malware) is generally delegated to dedicated, installable application software or third-party utilities, such as Antivirus programs. Therefore, while the OS facilitates security, comprehensive virus protection is considered an auxiliary or application-level function, not a core, mandatory function of the OS kernel.

The incorrect option is (1):
Memory management is a critical and foundational function of the operating system. This process is responsible for efficiently controlling and coordinating the computer's primary memory (RAM), which is vital for system performance and stability. The OS must keep meticulous track of which memory areas are used and by which process, dynamically allocating and deallocating memory blocks as programs start and finish. Furthermore, the OS is responsible for implementing complex techniques like virtual memory, allowing programs to exceed the physical capacity of RAM by using disk space as a temporary extension.

The incorrect option is (2):
Disk management is an essential operating system function that falls under the general umbrella of storage management. The OS is responsible for preparing storage media, such as hard drives and SSDs, by partitioning and formatting them to establish a usable file system. This core function involves managing the physical allocation of disk space, handling the complex input/output (I/O) requests, and controlling the reliable transfer of data between the main memory and the persistent storage devices. This service is non-negotiable for system persistence.

The incorrect option is (3):
File management is another foundational duty of the operating system, working in tandem with disk management. This function provides the logical, user-friendly view of data, handling the creation, deletion, reading, and writing of files and directories. The OS maintains the hierarchical structure of the file system, enforces access permissions and security protocols for data, and ensures the integrity and consistency of all stored information. Without robust file management, the user would have no structured way to organize or access their programs and documents.