Which of the following is NOT hardware

The multiple choices provided for this question are

A. wireless network router

B. x-box 360 game controller

C. virus scanner

D. flat-panel monitor

The answer is (C) virus scanner

Hardware, in Information Technology, is the physical aspect of computers, telecommunications, and other devices. It is any physical component that contains a circuit board or other electronics. An example is the screen on which you are using to read this, which brings us to option D

Software, by contrast, is a collection of instructions that enable the user interact with computer hardware. A Virus scanner is an example of a software program. A Virus scanner can also be known as anti-virus software. An anti-virus software scans and identifies viruses in a computer device.

Virus scanner is the one that cannot consider as hardware.

Hardware consist of all part of your computer that do not possess any physical form (such as monitor, mouse, printer, etc.)

A virus scanner is a form of program that is used to protect your device from unwanted programs, so it does not possess any physical form.