What must toilet facilities in a salon contain at a minimum?

The correct choice highlights the essential components that should be present in toilet facilities within a salon to ensure proper hygiene and sanitation standards. A salon's restroom must contain a commode, which is crucial for proper waste disposal, and a lavatory, allowing for handwashing after using the restroom. Additionally, a soap dispenser is necessary for maintaining hand hygiene, which is essential in a setting where personal services are provided. The inclusion of single service towels helps to prevent the spread of germs, as they can be disposed of after use, promoting a clean environment. A waste basket is also vital for safely discarding used towels and maintaining a tidy area.

This combination of facilities supports cleanliness and meets health regulations that govern salons, ensuring both staff and clients have access to suitable hygiene resources. In contrast, the other options lack one or more of these critical components, which would not adequately support sanitation standards required in a professional salon environment.