Which of the following is not an operating system?

A) Internet Explorer
B) Linux
C) Leopard
D) Microsoft Windows

A.) Internet Explorer

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To determine which of the given options is not an operating system, we need to understand what an operating system is. An operating system is a software that manages computer hardware and software resources, providing services for computer programs. It serves as an intermediary between the computer hardware and the user.

Now, let's examine each of the options:

A) Internet Explorer: Internet Explorer is not an operating system. It is a web browser developed by Microsoft and designed to be used with various versions of the Windows operating system.

B) Linux: Linux is an operating system. It is an open-source Unix-like operating system that is widely used in servers, mainframes, and personal computers.

C) Leopard: Leopard is the code name of an operating system version. In this case, it refers to Mac OS X Leopard, which is an operating system developed by Apple.

D) Microsoft Windows: Microsoft Windows is an operating system. It is a series of graphical operating systems developed by Microsoft and widely used on personal computers.

Therefore, option A) Internet Explorer is not an operating system.