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

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

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Operating System (OS)
Data encryption

is mostly used by financial networks
is not necessary, since data cannot be intercepted
is mostly used by public networks
None of these
cannot be used by private installations

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