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

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

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Operating System (OS)
Thrashing

always occurs on large computers
None of these
can be caused by poor paging algorithms
is a natural consequence of virtual memory systems
can always be avoided by swapping

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