Operating System (OS)
Semaphores

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

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Operating System (OS)
The term 'polling' in a computer means a process by which a computer system

multiplexes the inputs and updates the memory accordingly
None of these
inquires to see if a terminal has any transaction to send
detects/corrects errors
decides correct alternative by analysing several ones

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