Which of the following attributes can be saved within the properties of an entity?

The answer is correct because the attributes listed in this choice are standard properties associated with entities in Mendix. These attributes are automatically managed by the Mendix framework and serve to track the lifecycle of the data records effectively.

For example, the Created Date property captures when the entity was first created, providing a historical context for the data. The Changed Date property indicates the last time the entity was modified, which is crucial for understanding data updates and maintaining data integrity. The Owner property often signifies the user or system responsible for the data, offering accountability. Lastly, the ChangedBy attribute is useful for auditing purposes as it records who made modifications to the entity, enhancing security and traceability.

These attributes align with the common practices in data management within Mendix, catering to the need for tracking changes and ownership of data entities systematically. Other options contain attributes that may not fully align or are not standard in Mendix entity management or lack the specificity required for effective data handling.