A department decided to change the Gnome Display Manager's greeting. Which of the following configuration files should an administrator edit?

`/etc/gnome/greeting` is not a standard configuration file path for modifying the GDM greeting.

`/opt/gnome/share/greeting` is not a standard configuration file path for modifying the GDM greeting.

`/etc/X11/gmd.conf` is not the correct configuration file for GDM greeting changes; GDM typically uses a different configuration structure, often involving the `gdm.conf` file in a different location or more modern DConf settings.

The `/etc/X11/gdm/Init/Default` script is executed by GDM upon initialization, prior to the login screen appearing, and is the correct location to customize the GDM greeting or set display properties. This script allows for running commands or scripts that configure the display environment for the GDM login.