The following partially completed script finds and counts unique lines in a file. Select the correct option for the script to perform its operation correctly.

Note : Use the 'man' command to look up the various command options if necessary.

#$!/$bin$/$bash

if $[$ $# $-$ne $1]$

then

echo "Usage: $$0$ filename"

exit $1$

fi

Answer $1$ Question $5$