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)
File record length

None of these
Should always be variable
depends upon the size of the file
should always be fixed
should be chosen to match the data characteristics

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