Operating System (OS)
The primary purpose of an operating system is:

To make the most efficient use of the computer hardware
To allow people to use the computer
To keep systems programmers employed
To make computers easier to use

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Operating System (OS)
Virtual Memory

allows multiple programs to reside in separate areas of core at the time.
consists of those addresses that may be generated by a processor during execution of a computation.
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
is a method of allocating processor time.
None of these

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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
None of these
decides correct alternative by analysing several ones
detects/corrects errors
inquires to see if a terminal has any transaction to send

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