Operating System (OS)
A program

None of these
is a device that performs a sequence of operations specified by instructions in memory.
is the device where information is stored
is typically characterized by interactive processing and time of the CPU
is a sequence of instructions

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Operating System (OS)
Semaphores

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

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