The layers that SAP R/3 include are:

The correct answer identifies the three fundamental layers of SAP R/3 architecture: the Database Layer, Application Layer, and Presentation Layer.

The Database Layer serves as the backbone of the system, storing all the data used by the SAP applications. It manages the data storage and retrieval, ensuring that data integrity and consistency are maintained across various processes.

The Application Layer is where the business logic is executed. It handles the processing of data, executing the necessary business operations, and managing the task of data manipulation. This layer is crucial as it interfaces between the end-users and the database.

The Presentation Layer is the interface through which users interact with the SAP system. It displays data and manages user inputs, allowing users to perform tasks and inquiries. This layer translates user requests into actions to be processed by the Application Layer.

Together, these layers work cohesively to create a robust system that handles complex business processes efficiently. Understanding these layers is essential for anyone working with SAP software, as they provide clarity on how various components interact and function within the system.