What characteristics must the catwalk possess?

Answer: B — Must be solid and free of debris

The correct characteristic of the catwalk is that it must be solid and free of debris. This is essential for safety and functionality during pre-trip inspections and operations. A solid catwalk ensures that the driver can safely move from the tractor to the trailer without risking slips or falls, especially when the surface is wet or dirty. Additionally, being free of debris allows for clear access and movement, minimizing the chance of accidents caused by obstructions. The emphasis on a solid structure is vital; if the catwalk is compromised or unstable, it could lead to serious safety hazards. Therefore, maintaining its condition is crucial for both securing loads effectively and ensuring safe, efficient operations while handling the tractor-trailer.