Which of the following should be documented for client safety?

Documenting client preferences is essential for client safety because it allows the technician to tailor services to meet the specific needs and desires of each individual client. Understanding a client's preferences—whether it pertains to nail products, service types, or aftercare instructions—ensures that the salon provides a comfortable and satisfying experience. It also helps to prevent potential adverse reactions, as some clients may have allergies or sensitivities to certain products. Moreover, by having this information documented, it fosters a better relationship between the technician and the client, promoting trust and satisfaction.

In this context, the other options do not directly contribute to client safety in the same way. For instance, while documenting licenses of all staff is crucial for regulatory compliance, it doesn’t specifically relate to individual client safety. Similarly, fees for services and services obtained during previous visits, while important for record-keeping and business operations, do not have a direct impact on the immediate safety and well-being of clients during their visit. Therefore, focusing on client preferences stands out as the most relevant factor for ensuring their safety.