You have just set up the Gnome Display Manager as your default display manager. What file should you edit to change the default greeting for it?

A.
/etc/X11/prefdm

B.
/etc/X11/XF86Config

C.
/etc/X11/gdm.conf

D.
/etc/X11/gdm/lnit/Default

Explanation/Reference:
see http://library.gnome.org/admin/gdm/stable/configuration.html.en and http://library.gnome.org/admin/gdm/stable/configuration.html.en#greetersection