The files in the /etc/skel directory are used by the…
A.
pwconv command
B.
pwunconv command
C.
useradd command
D.
passwd command
Explanation/Reference:
useradd uses the config-file /etc/default/useradd which contains the shell variable $SKEL, that points to /etc/skel (if uncommented). useradd copies all files and directories in $SKEL to the new home directory.