The three layers in a three-layer architecture are:

1. Presentation Layer: This is the topmost layer of an application. The main function of this layer is to communicate with the application's user interface. It includes the components that interact with the user, such as the graphical user interface (GUI) and the user input validation.

2. Business Logic Layer: This is the middle layer that contains the business logic, rules, and policies of the application. It acts as a mediator for data exchange between the presentation layer and the data layer. This layer is also responsible for processing commands, making logical decisions and evaluations, and performing calculations.

3. Data Layer: This is the bottom layer that handles data storage and retrieval from the database. It includes the data access components and the data itself. This layer is responsible for communicating with the database and performing CRUD operations (Create, Read, Update, Delete).

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The three layers in a three-layer architecture are:

1. Presentation Layer: This is the topmost layer of an application. The main function of this layer is to communicate with the application's user interface. It includes the components that interact with the user, such as the graphical user interface (GUI) and the user input validation.

2. Business Logic Layer: This is the middle layer that contains the business logic, rules, and policies of the application. It acts as a mediator for data exchange between the presentation layer and the data layer. This layer is also responsible for processing commands, making logical decisions and evaluations, and performing calculations.

3. Data Layer: This is the bottom layer that handles data storage and retrieval from the database. It includes the data access components and the data itself. This layer is responsible for communicating with the database and performing CRUD operations (Create, Read, Update, Delete).

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The three layers in a three-layer architecture are:

1. Presentation Layer: This is the topmost layer of an application. The main function of this layer is to communicate with the application's user interface. It includes the components that interact with the user, such as the graphical user interface (GUI) and the user input validation.

2. Business Logic Layer: This is the middle layer that contains the business logic, rules, and policies of the application. It acts as a mediator for data exchange between the presentation layer and the data layer. This layer is also responsible for processing commands, making logical decisions and evaluations, and performing calculations.

3. Data Layer: This is the bottom layer that handles data storage and retrieval from the database. It includes the data access components and the data itself. This layer is responsible for communicating with the database and performing CRUD operations (Create, Read, Update, Delete).

In a three-layer architecture, what are the three layers?

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