Operating System (OS)
A page fault

is a reference to a page belonging to another program
None of these
occurs when a program accesses a page of memory
is an access to a page not currently in memory
is an error is a specific page

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

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

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