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Which of the following statements is incorrect? Operating systems must provide both protection and security. Operating...

Which of the following statements is incorrect?

Operating systems must provide both protection and security.

Operating systems provide both command line as well as graphical user interfaces.

An operating system manages system resources.

An operating system provides an environment for the execution of programs.
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Answer #1 
Correct statements about Operating systems are
Operating systems must provide both protection and security.
An operating system manages system resources.
An operating system provides an environment for the execution of programs.

So, incorrect statement is
Operating systems always provide both command line as well as graphical user interfaces.

Operating systems provide both command line as well as graphical user interfaces.
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