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

detects/corrects errors
None of these
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

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

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