In a typical EHR environment, which component handles the presentation layer and business logic?

• A. Database server
• B. Application server
• C. Client device
• D. Network switch

Answer: (B)

In a typical EHR setup, software duties are divided into layers: presentation, business logic, and data. The component that handles both the presentation layer and the runtime business logic is the application server. It runs the application code, enforces workflows and validation, manages user authentication and authorization, and can generate or provide the content the client UI renders. In other words, it sits between the user interface (often on the client device) and the data store, coordinating how data is processed and shown. The database server’s role is to store and query patient data, not to manage UI or business rules. The client device is for displaying the interface, while the network switch is just infrastructure. Therefore, the application server is the best fit for handling both presentation and business logic.