A researcher wants to conduct a secondary analysis using a Centers for Disease Control (CDC) database of prostate cancer patients that was collected by the agency. The researcher was not part of the original database creation and the database was originally created to monitor public health and not for research purposes. The database is publicly available. The database does not include any identifiers. Consent from the patients is not required because: The researcher did not collect the data directly from the human subjects. The researcher proposes to study a disease that affects public health. The database is publicly available. The CDC is a federal agency.