Operating System (OS)
Assembler language

is a mnemonic form of machine language
None of these
is quite different from the SCL interpreter
is usually the primary user interface
requires fixed-format commands

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

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

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