How should rotors be assessed during inspection?

The correct choice emphasizes checking for any signs of damage or instability that could affect the vehicle's braking performance. During a pre-trip inspection, it is crucial to ensure that the rotors are free from cracks and warps, as these can lead to brake failure or reduced effectiveness. Additionally, confirming that the assembly is secure prevents issues related to the rotors becoming loose during operation.

In contrast, being completely smooth without rough edges, while desirable, does not provide a holistic view of the rotor's condition, as other critical factors like structural integrity are not considered. Similarly, while shiny and clean rotors may look good superficially, they could still have hidden issues like cracking or warping that would jeopardize safety. Lastly, identifiable markings for maintenance are useful, but they do not directly address the immediate assessment of the rotors' physical condition as outlined in the correct choice.