Which type of server application architecture model separates the database engine from the business logic?

The two-tier application architecture model is characterized by the separation of the database engine from the business logic. In this model, the application is typically divided into two layers: the client-side, which contains the user interface and business logic, and the server-side, which handles the database management. This separation allows for more efficient processing because the client can send requests to the server to perform operations on the database without the need for the business logic to be on the server itself.

In contrast, the single-tier architecture integrates both the business logic and the database on a single layer, leading to less flexibility and scalability. The multi-tier architecture involves more layers, which may include additional tiers for business logic, database, and presentation; however, these tiers can also include the database and business logic on different servers. The cloud-based architecture refers to services delivered over the internet, which can encompass various architectures but does not specifically indicate the separation of database and business logic as seen in the two-tier model.