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

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

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Operating System (OS)
Feed back queue

None of these
are very easy to implement
are used to favor real-time tasks
require manual intervention to implement properly
dispatch tasks according to execution characteristics

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