Operating System (OS)
Virtual Memory

is a method of allocating processor time.
consists of those addresses that may be generated by a processor during execution of a computation.
None of these
allows multiple programs to reside in separate areas of core at the time.
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.

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Operating System (OS)
The term "operating system" means

a set of programs which controls computer working
the way a computer operator works
conversion of high level language into machine code
the way a floppy disk drive operates
None of these

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