Final answer:
Source control management tools like Git help maintain the integrity of a code base by preventing old code from being added to current versions and tracking changes.
Step-by-step explanation:
A source control management tool like Git, Subversion, or Mercurial can help prevent old code from being added to current versions of an application. These tools are designed to manage changes to the source code and keep track of every modification. By doing so, they not only prevent the inadvertent addition of outdated code fragments but also allow developers to revert to earlier versions if necessary. They serve as a safety net, ensuring that the integrity of the code base is maintained, facilitating collaboration among team members, and enabling a systematic approach to version control.