Operating System (OS)
Semaphores

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

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

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

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