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

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

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Operating System (OS)
Multiprogramming systems:

are easier to develop than single programming system
execute each job faster
None of these
execute more jobs in the same time period
are used only on large mainframe computers

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