Which of the following is required in the restroom facilities of a cosmetology school?

The restroom facilities of a cosmetology school must include both a commode and a lavatory to meet health and safety standards. This requirement ensures that students have access to proper sanitation facilities, which are essential for maintaining hygiene in a cosmetology environment where services are rendered to clients. The presence of a commode provides necessary restroom functions, while the lavatory allows for handwashing, which is crucial before and after performing any beauty services. This combination promotes cleanliness and helps prevent the spread of germs and infections, ensuring a safe and professional environment for both students and clients.

Other options might not fully satisfy the health and safety requirements: having only a commode does not provide for adequate hygiene, a shower and changing area may not be necessary for all cosmetology activities, and multiple stalls, while possibly beneficial for convenience, do not replace the essential need for both a commode and lavatory.