What must advertising for a cosmetology school include?

The correct choice emphasizes the critical components that a cosmetology school advertisement must highlight to align with regulatory standards and the curriculum focus of the institution. By including "hair, skin, and nails," the option accurately reflects the core areas of training provided in cosmetology programs. This comprehensive representation ensures prospective students understand the full spectrum of the services they will learn, which encompasses not only hairstyling but also skin care and nail technology.

This approach fulfills legal requirements that aim to inform the public accurately about the school's offerings, ensuring transparency and clarity for students who wish to pursue a career in cosmetology. Each area—hair, skin, and nails—represents essential skills needed in the field, which are typically outlined in the curriculum of accredited programs, thereby providing a clear understanding of the education being provided.