You just started X for the first time and noticed that the display does not use the entire screen.
What program can you use to fix this?

A.
tweakscreen

B.
xvidtune

C.
xf86config

D.
XF86Setup

Explanation:
tweakscreen xf86config XF86Setup commands do not exist (as programs at least)

xvidtune video mode tuner for XFree86.