What can you do with an external entity in a Mendix application?

In a Mendix application, the use of external entities is multifaceted, which is why the choice that includes all possibilities is the correct answer.

When you work with external entities, you can create new external entities that represent data from external systems, allowing for data modeling that includes these entities directly within your Mendix application. This allows developers to define how these entities relate to existing entities within the Mendix model, effectively bridging different data sources.

Additionally, external entities enable the aggregation of data across systems. This capability allows the application to pull in and interact with data stored outside of the Mendix environment, facilitating a comprehensive view of information that spans various platforms and services.

Furthermore, the integration with internal business logic is a critical aspect of using external entities. By establishing connections to external data sources, you can incorporate this data into the application's core processes, enabling the application to perform operations based on insights derived from external systems, thereby enriching the application's functionalities and business decisions.

By understanding that external entities serve all these purposes—creating new entities, aggregating data, and integrating with business logic—the comprehensive utility of external entities in a Mendix application is highlighted.