A Linux administrator needs to add some files in a directory to the Git repository but must exclude some local .tmp files that are occasionally created by the scripts. Which of the following is the…

`git rm` is used to remove files from the Git repository and working directory, not to prevent them from being tracked in the first place.

`git add -x` is not a valid Git command for excluding specific file types during the staging process.

Appending `.tmp` to the `.gitignore` file tells Git to ignore any file or directory matching this pattern when performing operations like `git add`. This prevents the temporary files from being staged or committed to the repository, fulfilling the requirement to exclude them.

`rm -rf .tmp` would delete the `.tmp` files from the filesystem, which is not the goal; the goal is to exclude them from Git tracking while they may still exist locally.