Code Red is a type of computer virus (option C).

Explanation:
A computer virus is a malicious software program that can replicate itself and spread from one computer to another. It is designed to cause harm, disrupt computer operations, steal information, or gain unauthorized access to systems.

Code Red was a particularly notorious computer virus that emerged in July 2001. It targeted computers running Microsoft Windows operating systems, specifically Windows NT and Windows 2000. The virus exploited a vulnerability in the Microsoft Internet Information Services (IIS) web server software.

Here is a breakdown of the options:

a) An Antivirus Program: Antivirus programs are software designed to detect and remove viruses from computer systems. Code Red is not an antivirus program; it is a virus itself.

b) A photo editing software: Photo editing software is used to modify and enhance digital images. Code Red is not related to photo editing in any way.

c) A computer virus: As explained above, Code Red is a computer virus that infected vulnerable Windows systems and caused disruptions.

d) A video editing software: Video editing software is used to edit and manipulate video footage. Code Red has no relation to video editing software.

In conclusion, Code Red is a well-known computer virus that targeted Windows systems and caused significant damage. It serves as a reminder of the importance of keeping computer systems up to date with security patches and using reliable antivirus software to protect against such threats.