Final answer:
The Three-tiered model uses an intermediary server between the end user and the database, consisting of presentation, application, and data tiers. This architecture enhances security, scalability, and maintainability compared to other architectures.
Step-by-step explanation:
The model used to provide an intermediary server between the end user and the database is the Three-tiered model. This architecture is broken down into three levels: presentation, application (or logic), and data. The presentation tier is the user interface, the application tier contains the business logic, and the data tier includes the database and data storage.
In a three-tiered architecture, the application server (middle tier) acts as the intermediary that translates the user's requests to the database tier and provides the required data back to the user's interface. This approach offers several advantages, including improved security, because the database server is not directly exposed to the user. It also allows for better scalability and maintainability, as each tier can be developed and modified independently.
The other options listed—One-tiered, Two-tiered, and Relational database—do not specifically describe a model with an intermediary server between the user and the database. One-tiered architecture is where the presentation, logic, and data components are all on one platform or system, Two-tiered architecture involves a direct connection between the client and the server without an application server in the middle, and Relational database is a type of database design that stores data in tables with relationships between them.