X is running okay but you’re concerned that you may not have the right color depth set.
What single command will show you the running color depth while in X?

A.
xcd

B.
xcdepth

C.
cat /etc/X11

D.
xwininfo

E.
xcolordepth

Explanation:
xcd xcdepth xcolordepth are not real commands
/etc/X11 is a directory, which you cannot cat