Which action demonstrates adequate knowledge during a health inspection?

Having a certificate from an approved examination company demonstrates adequate knowledge during a health inspection because it signifies that the person has completed a formal education program on food safety and sanitation. This certification indicates that the individual is trained in the best practices for handling food, understanding foodborne illnesses, and implementing proper hygiene protocols. Health inspectors look for such credentials to ensure that those in charge of food safety in the establishment possess the necessary knowledge and skills to maintain safe food handling practices.

In contrast, displaying a menu does not convey any specific knowledge of food safety practices. While customer reviews can provide insight into customer satisfaction, they do not reflect on the establishment’s adherence to health standards. Additionally, providing a food safety poster can be a helpful visual aid, but it does not necessarily indicate that the staff has received formal training or understands food safety principles as required by health regulations.