You are experimenting with a binary in /tmp/foo.d that expects its configuration file at /etc/foo.conf. You
don’t want to save it there, but use a symbolic link to /tmp/foo.d/foo.conf instead. Which command would
accomplish that?

A.
ln -s /tmp/foo.d/foo.conf /etc/foo.conf

B.
ln /tmp/foo.d/foo.conf /etc/foo.conf

C.
ln -s /etc/foo.conf /tmp/foo.d/foo.conf

D.
ln /etc/foo.conf /tmp/foo.d/foo.conf