Which entity allows sharing its identifier with the base entity?

The correct answer is related to the concept of entity inheritance and relationships within OutSystems. An extension entity is designed to extend the base entity by adding additional attributes while retaining the ability to share the same identifier. This means that the extension entity builds upon the foundation laid out by the base entity, allowing for more complexity and specificity in data modeling.

When sharing an identifier, the extension entity can leverage the same unique identifier as the base entity, which is critical for maintaining relationships between different entities in a database. This allows for a seamless integration of additional data attributes within the existing framework of the base entity, ensuring data integrity and consistency while enabling functionality like polymorphism.

Other types of entities, such as junction entities and static entities, do not inherently support this kind of identifier sharing in the same way that extension entities do. Junction entities are primarily used for establishing many-to-many relationships between two or more entities, while static entities serve as reference data that does not change and typically do not have relationships as complex as those that involve identifiers from base entities. Dynamic entities are created at runtime and do not have a pre-defined model as extension entities do, making them unsuitable for sharing identifiers with a base entity.