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

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

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Operating System (OS)
Round-robin scheduling

allows processor-bound tasks more time in the processor
gives each task the same chance at the processor
allows interactive tasks quicker access to the processor
None of these
is quite complex to implement

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