Which of the following manages the computer resources ?

An operating system (OS) is a set of programs that manages a computer’s resources, especially the allocation of those resources among other programs. It does so by interacting with computer’s software and hardware. Typical resources include the central processing unit (CPU), computer memory, file storage, input/output (I/O) devices, and network connections. It establishes a user interface, and executes and provides services for applications software.