Operating System (OS)
Semaphores

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

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Operating System (OS)
Under virtual storage,

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

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