A data model is required to create which of the following rules?

A data model is essential for creating Declare Expressions because it defines the structure of the data that the application will use. Declare Expressions allow you to specify calculations or expressions based on the properties of objects in your data model. They dynamically update properties based on changes in data, which is crucial for ensuring data consistency and integrity within the application.

In contrast, other rule types such as Sections, Validate rules, and Flows serve different purposes. Sections are primarily for user interface layout and do not require a comprehensive data model. Validate rules check the integrity of data against defined conditions, and while they utilize properties, they do not necessitate the same structured approach to data modeling as Declare Expressions. Flows represent the business process and control the navigation between various tasks and screens, focusing more on user interaction rather than the underlying data structure. Thus, the link between data modeling and Declare Expressions highlights the dynamic nature of how data is manipulated, making a data model crucial for this type of rule.