Which of the following best describes the purpose of a K-Code?

The purpose of a K-Code pertains to the classification of instructor roles within the aviation field. K-Codes serve as a systematic way to designate the specific capabilities and qualifications of instructors, ensuring that instructional content aligns with the necessary standards and requirements for training. This classification is crucial for maintaining safety and effectiveness in flight operations, as it allows for the appropriate assignment of instructors based on their expertise.

In contrast, the other options focus on different operational aspects. While aircraft readiness deals with the operational status of the aircraft, flight risk assessment involves evaluating the safety implications of a planned flight. Marking flight restrictions is a separate issue related to specific guidelines or limits imposed on aviation operations. Each has its own distinct purpose but is not related to the K-Code's role in classifying instructors.