Final answer:
The registry must perform follow-up on both reportable-by-agreement cases and all eligible analytic cases. The correct answer is C. Both (A) and (B).
Step-by-step explanation:
When it is required that the registry perform follow-up on these cases, it means that the registry must follow up on both reportable-by-agreement cases and all eligible analytic cases. This is because both types of cases are important and require further investigation or action.
Reportable-by-agreement cases are those where the parties involved have agreed to report the case to the registry. These cases usually involve incidents or situations that are of concern and require further attention. The registry must follow up on these cases to ensure that appropriate measures are taken.
All eligible analytic cases refer to cases that meet certain criteria for analysis or investigation. These cases are selected based on specific factors or indicators that indicate a need for further review. The registry must also follow up on these cases to gather more information, analyze the data, and take appropriate actions based on the findings. Therefore, the correct answer is C. Both (A) and (B) because the registry must perform follow-up on both reportable-by-agreement cases and all eligible analytic cases.