What must a new Validation Gosu Rule accomplish for a Doctor entity?

The correct choice emphasizes the importance of validating license expiration in both the user interface and the application programming interface (API). This dual validation is essential because it guarantees data integrity across different access points to the system. User inputs can often be manipulated or bypassed in the UI, so validating the same data through the API helps ensure that the application maintains consistent rules and prevents unauthorized or incorrect data changes from occurring.

By implementing this validation rule, the system protects itself against errors or malicious inputs and ensures that all necessary checks are performed regardless of how the data was submitted. This comprehensive approach is particularly critical in environments where regulatory compliance is necessary, such as for healthcare-related entities like a Doctor, where license verification can impact legal and operational aspects. For this reason, performing validation in both contexts enhances the robustness and reliability of the application.