Operating System (OS)
File record length

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

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

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

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