If a materials class is marked as "forbidden," what is allowed to be hauled?

When a material's class is marked as "forbidden," it indicates that the transport of that specific hazardous material is prohibited under any circumstances. This classification means that no entity can legally transport that material due to its hazardous nature and the potential risks it poses.

As such, options indicating that one can haul "any other hazardous material" or "nothing" alone do not align with the implications of a "forbidden" classification. The correct understanding combines the prohibitions from both options, reflecting that not only is the specific "forbidden" material not allowed, but it is also understood that nothing associated with that classification can legally be transported. Thus, the only permissible approach is that one cannot haul a forbidden cargo or any materials related to it, cementing the rationale for the chosen answer.