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

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

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Operating System (OS)
Data encryption

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

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