Documents classified as 'Restricted' require secure handling and storage to prevent unauthorized access. The term 'secure container' implies that the document is in a physically secure environment, which could include a locked filing cabinet, safe, or a secured access room designed for storing sensitive information. Coupled with the need for security clearance for access, this environment meets the requirements for protecting 'Restricted' data. Incorrect answers might neglect to acknowledge the essential integration of physical security measures with information security practices for protecting 'Restricted' data.