Operating System (OS)
Semaphores

None of these
are used for memory management
synchronize critical resources to prevent deadlock
synchronize critical resources to prevent contention
are used to do I/O

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

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

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