What must be displayed prominently in a barber shop?

In a barber shop, it is essential to prominently display the barber's license and the health inspection certificate. The barber's license serves as proof that the barber has met the necessary training and regulatory requirements to provide services, ensuring clients that they are receiving care from a qualified professional. The health inspection certificate demonstrates that the establishment complies with local health and safety regulations, which is crucial for maintaining hygiene and safety standards in the shop. Having these documents visible not only instills confidence in clients regarding the professionalism and safety of the services provided but is also a legal requirement in many regions to operate a barber shop.

While the other options may contribute to the atmosphere or marketing of the barber shop, they are not mandated by health and regulatory standards in the same way that the license and health inspection certificate are.