Correct Option: C

A computer virus is a computer program that can replicate itself and spread from one computer to another. Computer virus is a term applied to any program that is designed to damage data stored on a computer system or network. The virus may infect documents, applications or worst of all system files that are essential to the correct running of the computer system. A virus itself is programme software and has effect basically on software and not hardware. It could have effect on the systems or Application software to execute specific instructions on the hardware.