4. Which of the following expression is wrong for system calls? A) If a process is running in kernel mode and needs to pass user mode, it makes a system call. B) A process can make a system call by calling library procedures. C) Windows operating system have Windows 32 APIs instead of library procedure. D) The system calls in Windows can be only accessed through Win32 API. E) The system calls vary from operating system to operating system.

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.