A systems administrator installed Git on a new workstation and wants to ensure all Git projects on this machine are initialized with the same username and email address. Which of the following should

The `git config --global user.name` command writes the specified username to the global configuration file at ~/.gitconfig. Because Git reads this file for every repository on the workstation when no local repository-level override exists, this single command ensures consistent author identity across all projects.

This command appends to .git/.gitconfig (a per-repository path that does not exist at the global scope) and uses the invalid key `email.addr` instead of `user.email`, so it neither sets a global value nor uses a recognized Git configuration key.

This command contains a syntax error (mismatched quotes), attempts to write to a per-repository path rather than the global config file, and uses `username` instead of the correct key `user.name`, making it entirely invalid.

Omitting the `--global` flag scopes the setting to the current repository's local .git/config only, and `username` is not a recognized Git configuration key - the correct key is `user.name`.

The `git config --global user.email` command writes the email address to the same ~/.gitconfig file using the correct key `user.email`. Without the `--global` flag the setting would be scoped only to the current repository's .git/config, so the flag is essential for the machine-wide consistency the administrator requires.

This command lacks the `--global` flag so it would only apply locally to the current repository, uses the invalid key `email.addr` instead of `user.email`, and contains a syntax error with a missing opening quotation mark.