Which of the following are valid data sources for a CDS view entity?

A CDS (Core Data Services) view entity is designed to provide a semantic, unified representation of data sources in the SAP ecosystem. Among the various options listed, using another CDS view entity is a valid data source for a CDS view. This allows developers to build on existing models, leveraging previously defined views for further abstraction and complexity management. By referencing another CDS view, you can create layered data models and ensure consistency in how data is represented across different applications or analyses.

The flexibility to incorporate existing CDS views not only enhances reusability but also supports a cleaner architecture, allowing for better maintenance and adaptability of your data models. This is particularly important in complex systems where integrity and clarity of data relationships are critical.

The other options, such as a structure, an internal table, or a database table, do not align with the specific data source capabilities of a CDS view entity. CDS views primarily rely on database table structures or views, but they do not directly employ internal tables or structures as their data sources in the same way they would with existing CDS view entities. By focusing on leveraging other CDS views, developers can efficiently enrich their data models while abiding by best practices in CDS design.