Which of the following is a feature of Relational Databases?

A feature of relational databases is that they create a data model for structured data. Relational databases organize data into tables, with each table consisting of rows and columns. This tabular structure allows for straightforward data relationships and enforces data integrity through primary and foreign keys. The relational model provides a systematic way to define, manipulate, and query data, typically through Structured Query Language (SQL).

This design is crucial because it enables complex queries and ensures that data is stored efficiently and accessibly, particularly for business applications that require organized and reliable information retrieval. By utilizing structured data, relational databases can enforce data integrity rules and relationships, which is foundational for effective data management in operational systems.

As for the other choices, they reference concepts that do not accurately describe relational database features. For instance, while cloud storage can be used with relational databases, it is not a distinguishing feature of the relational model itself. Similarly, business rules enforcement is intrinsic to relational databases, as they rely on integrity constraints to maintain valid data entries. Lastly, the concept of storing data only in flat files contradicts the essence of relational databases, which utilize a multi-dimensional approach rather than a simple flat-file structure.