If you want to use a marker image called arrow.png that is in a folder called assets, what CSS property would you use?
arrow.png
assets
ul { list-marker: url('assets/arrow.png'); }
ul { marker-image: url('assets/arrow.png'); }
ul { bullet-image: url('assets/arrow.png'); }
ul { list-style-image: url('assets/arrow.png'); }