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

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

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Operating System (OS)
Under virtual storage,

only the active pages of a program are stored in primary storage
two or more programs are stored concurrently in primary storage
None of these
a single program is processed by two or more CPUs
interprogram interference may occur

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