Which of the following is a shop requirement for a salon taking on an apprentice?

A shop requirement for a salon taking on an apprentice is that the salon owner must be a licensed cosmetologist. This requirement ensures that the apprentice is under the supervision of a qualified professional who has the necessary training and credentialing to provide education and guidance. A licensed cosmetologist possesses the expertise required to teach and oversee the apprentice's work, ensuring compliance with safety and sanitation standards, as well as providing a comprehensive learning experience.

In contrast, salon size, prior experience requirements, or the types of services offered do not directly relate to the legal and regulatory standards necessary for supervising an apprentice. The focus on having a licensed salon owner underscores the importance of quality training and adherence to professional standards in the cosmetology field.