Carrying instruments in or on garments or uniforms is:

Carrying instruments in or on garments or uniforms is prohibited primarily for hygiene and safety reasons. This practice can lead to contamination of tools and uniforms, creating a breeding ground for bacteria and pathogens. When these instruments are not stored properly, they may become unsanitary and pose risks not only to the individual handling them but also to clients receiving services. Proper handling and storage of tools ensure both the safety of the operator and the health of customers by minimizing the risk of cross-contamination.

The other choices suggest various degrees of acceptability for carrying instruments in garments. However, none of those options support the critical emphasis on maintaining hygiene standards in a salon or similar environments where cleanliness is paramount.