Operating System (OS)
All of the following are task performed by the operating system except

Performing housekeeping task like file compression and disk defragmentation
Controlling the access that application program has to the CPU
Managing hardware on the computer
Provides an interface for user to interact with computer

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Operating System (OS)
Multiprogramming

allows multiple programs to reside in separate areas of core at the time.
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.
consists of those addresses that may be generated by a processor during execution of a computation.
None of these

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