Which rule type in Pega is used to define how data is structured?

The rule type used to define how data is structured in Pega is the Data Type. Data Types in Pega are specifically designed to model and manage structured data representations, allowing users to define fields, data properties, and relationships among different data entities. When creating a Data Type, you can specify various attributes, such as data types for individual fields (e.g., text, number, date), and establish the hierarchy and associations with other Data Types. This organized structure is crucial for data integrity and enables efficient data handling within Pega applications. By utilizing Data Types, developers can ensure consistency and reusability of data across the application.

Other options like Field Type refer to the specifications of individual fields rather than the entire structure of the data, and Behavior Type is focused on defining the behavior and actions of data, without specifically addressing its structure. Rule Sets, on the other hand, are a collection of related rules but do not themselves define data structure directly. Therefore, the choice of Data Type is clearly the most appropriate when discussing the organization and arrangement of data within Pega.