Operating System (OS)
Which of the following is characteristic of an operating system?

memory management
None of these
error recovery
All listed here
resource management

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

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

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