Which of the following commands shows the current color depth of the X Server?

`xcd` is not a standard command for querying X server color depth.

`xcdepth` is not a standard command for querying X server color depth.

`xwininfo` is a utility that displays information about windows on an X server, and when queried for the root window, it provides details including the screen's visual information, from which the current color depth (e.g., 'Depth 24') can be determined.

`xcolordepth` is not a standard command for querying X server color depth.

`cat /etc/X11` would attempt to display the contents of the `/etc/X11` directory or a file named `X11`, neither of which shows the current X server's runtime color depth.