Which Git command is used to stop tracking a file that is added to .gitignore?

The command used to stop tracking a file that has been added to .gitignore is indeed "git rm --cached". This command removes the file from the staging area while keeping it in your working directory, which is essential when you want Git to ignore future changes to a specific file that you've already tracked. By utilizing the --cached option, you ensure that the file will not be included in future commits, while it remains available and untouched in your local project directory.

The other options do not correctly represent the functionality needed in this situation. There are no built-in Git commands named "git stop," "git track --stop," or "git untrack." Thus, only "git rm --cached" correctly addresses the requirement to stop tracking the specified file while preserving it in the local environment. This understanding is crucial for managing files and optimizing your .gitignore usage effectively.