Which command will redirect standard error to ls$-$output.txt$?$

echo $error ls$-$output.txt

ls $/$us$/$bin $>>>$ ls$-$output.txt $2>>>$&$1$

ls $/$us$/$bin $>2>$&$1>$ ls$-$output.txt

ls $/$us$/$bin $>$ ls$-$output.txt $2>$&$1$