Discussion
The part of OS that remains in memory permanently is called
Answer: D
The part of the OS that remains in memory permanently is the kernel.
The kernel is the core of the operating system: it manages processes, memory, devices and system calls, and is loaded at boot and kept resident in main memory until shutdown (which is why it is also called the resident monitor or nucleus). Every other program depends on it at all times.
The shell, or command interpreter, is an ordinary user program that reads commands and asks the kernel to carry them out; it can be loaded and unloaded like any other. An API is an interface through which programs request services, not a part of the OS kept in memory.
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