What warning is provided regarding the flashcards being used?

The warning regarding the flashcards emphasizes that they do not contain troubleshooting information. This is important because understanding how to address common issues or problems is crucial for effective use of materials or tools in any department, especially in optical environments like Costco. If users rely solely on the flashcards and encounter a situation that requires troubleshooting, they may find themselves unprepared and unable to resolve the issue efficiently. Recognizing that the flashcards are limited in this capacity allows users to seek additional resources or training that includes necessary troubleshooting guidance.

Other options could mislead users about the capabilities and intended audience for the flashcards. For example, while they may not include specific training materials for staff, it does not imply that they lack value for understanding basic concepts. Similarly, labeling them as outdated or only suitable for advanced users wouldn't accurately describe their purpose if they are designed to provide foundational support rather than detailed, specialized knowledge.