Operating System (OS)
Backups should be done

as several image copies, followed by an incremental
None of these
daily for most installations
as several incrementals, followed by an image copy
weekly for most installations

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

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

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