Operating System (OS)
User-Friendly Systems are:

None of these
easy to develop
required for object-oriented programming
becoming more common
common among traditional mainframe operating systems

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

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

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