An issue was discovered on a testing branch of a Git repository. A file was inadvertently modified and needs to be reverted to the master branch version. Which of the following is the BEST option to…

`git branch -b` is not valid syntax; the flag for creating and switching to a new branch is `-b` used with `git checkout`, and it creates a branch rather than restoring a file.

`git merge master testing` merges the entire master branch history into testing, which would affect all files, not just the one inadvertently modified.

`git stash branch master` creates a new branch from a stash entry; it does not restore a file from an existing branch.

The command `git checkout master -- file` instructs Git to restore the specified file to the exact version found in the master branch, leaving all other files in the testing branch untouched. The double-dash `--` explicitly separates the branch name from the file path, preventing ambiguity. This is the standard, targeted way to recover a single file from another branch without affecting the rest of the working tree.