Which of the following BEST describes riser data cable?

Riser data cable is specifically designed for vertical spaces between floors of a building, which is why the description that highlights its function in passing between two floors and requiring fire-stopping measures is the best choice. It is significant because riser-rated cables have a fire-resistant jacket that helps prevent the spread of fire between floors through vertical pathways like riser shafts.

This is a crucial safety feature in building wiring as it helps contain flames and smoke, protecting the integrity of the structure and the safety of its occupants. Other types of cables, such as plenum-rated cables, are used in spaces with air circulation for heating and ventilation systems, further emphasizing the distinct use of riser cables. Thus, the unique need for riser cables to comply with fire safety regulations makes this option the most accurate description.