Which of the following must a beauty shop have regarding its physical configuration?

A beauty shop is required to have certain physical configurations to ensure proper functionality, safety, and compliance with regulatory standards. The requirement for a beauty shop to be separated from another beauty shop by walls of permanent construction helps to address issues related to health and safety, as it provides sound insulation and maintains a degree of separation between businesses, which can be important in cases where services may generate noise, chemicals, or other factors that might affect adjacent businesses.

This separation also ensures that each beauty shop can maintain independent controls over their sanitary conditions and operations without interference, which is vital for compliance with local health regulations. The necessity of permanent construction helps to provide a stable and regulated environment in which beauty services can be safely administered.

In contrast, the other options, such as requiring an open-plan layout or specific restrictions on windows and floor levels, are not standard requirements for the physical configuration of a beauty shop. The focus on separation by permanent walls is more directly tied to the operational standards and health and safety protocols that govern beauty establishments.