One of your users has installed a commercial publishing program that works under X on a variety of UNIX and Linux platforms. The user made a series of configuration changes regarding the initial window size, location and color. Now he is having difficulties undoing these changes and is asking for your help. In which file would you think you would most likely find the configuration settings you are seeking to change?

A.
~/.Xdefaults

B.
~/.xinitrc

C.
~/.xconfig

D.
/etc/X11/XF86Config

Explanation/Reference:
From http://wiki.archlinux.org/index.php/Xdefaults#Xdefaults_syntax:

To see the default settings for your installed X11 apps, look in /usr/share/X11/app-defaults/.
The syntax of an Xdefaults file is as follows:
name.Class.resource: value

Here is a real world example:
xscreensaver.Dialog.headingFont: -*-fixed-bold-r-*-*-*-100-*-*-*-*-iso8859-1