Which of the following describes the steering shaft's condition?

The condition of the steering shaft is crucial for the safe operation of a vehicle, especially for a CDL Class B vehicle. A steering shaft that is securely mounted denotes that it is properly fastened and will maintain its position, ensuring precise handling and control while driving. This secure attachment prevents any unwanted movement or looseness that could compromise steering capabilities.

Being not cracked contributes significantly to the overall safety and function of the steering shaft. Cracks can indicate wear or damage that could lead to further failures.

While being worn out is a negative characteristic for the steering shaft, the correct condition requires that it is not only secure and intact but also performs optimally. Therefore, while options describing being not cracked and securely mounted are indeed correct, the best singular representation of the steering shaft’s condition focuses directly on the importance of it being securely mounted for immediate safety considerations.

In terms of the most relevant factors for reliable performance, the emphasis on it being securely mounted directly addresses the need for stability during operation, making it the most critical aspect to assess during a pre-trip inspection.