What does 'self-contained' mean in the context of beauty salons?

In the context of beauty salons, 'self-contained' refers to a salon's ability to function independently without dependence on external utilities. This includes having its own water supply, electrical systems, and necessary equipment to provide services. A self-contained salon can manage its operational needs, which can be crucial for functionality, especially in situations where access to public utilities might be limited.

Having access to external water sources would not meet this definition, as that would indicate reliance on outside systems. Similarly, while including multiple service units within a large salon may enhance the service offering, it does not directly relate to the independence of utilities that 'self-contained' signifies. Training staff in multiple areas of beauty focuses on personnel capabilities, rather than the structural and operational independence of the salon itself. Thus, the understanding of 'self-contained' aligns directly with the ability to operate without outside utilities, making this the correct choice.