Operating System (OS)
Operating system

provides a layered, user-friendly interface
All of these
links a program with the subroutines it references
enables the programmer to draw a flowchart
None of these

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

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

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