Which of the following is/are examples of operating systems: Unix/BSD, GNU/Linux, Windows, Mac OS X?

AUnix/BSD, GNU/Linux and Windows

BGNU/Linux, Windows and Mac OS X

CUnix/BSD, Windows and Mac OS X

DAll of the above ✓ Correct

Correct answer: (D) All of the above

Explanation

Unix/BSD, GNU/Linux, Windows and Mac OS X are all operating systems.

Leaving out Mac OS X wrongly drops a genuine operating system.

Leaving out Unix/BSD wrongly drops another genuine operating system.

Leaving out GNU/Linux likewise drops a real operating system.

An operating system manages a computer's hardware and its software.

Android and iOS are operating systems built for mobile devices.

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