What type of software change is specifically designed to correct a known bug?

The choice of "Patch" is appropriate because a patch is software designed specifically to address known vulnerabilities, fix bugs, or improve the functionality of a program. Patches are often smaller in size than full updates and can be deployed quickly to rectify specific issues that have been identified. They ensure that the software remains secure and operates as intended.

A hotfix is also related to correcting issues, but it typically refers to a very urgent fix that is released to resolve critical problems and may not necessarily go through the usual quality assurance process. While both align closely with the concept of addressing bugs, a patch is the more general term used for updates aimed at fixing bugs or vulnerabilities.

Version updates are more substantial releases that may include new features, enhancements, and bug fixes, while rollouts generally refer to the deployment process of software updates or new versions rather than the specific act of correcting bugs.

In summary, a patch stands out as the correct answer because it is directly associated with the resolution of identified bugs in software applications, serving the specific purpose of improvement and security without the broader scope implied in a version update or the urgency of a hotfix.