Is device management the function of an operating system that is responsible for process management, memory management and file management?

Device management is not typically considered one of the core functions of an operating system. Instead, device management is responsible for managing the communication between the operating system and the hardware devices connected to the computer, such as printers, scanners, and storage devices. This includes tasks such as device detection, configuration, and control. Process management, memory management, and file management are separate functions that are typically handled by the operating system.