1. Interoperability regulatory sandboxes shall be operated under the responsibility of the participating Union entities or public sector bodies. Interoperability regulatory sandboxes that entail the processing of personal data by public sector bodies, shall be operated under the supervision of the national data protection authorities as well as other relevant national, regional or local supervisory authorities. Interoperability regulatory sandboxes that entail the processing of personal data by Union entities shall be operated under the supervision of the European Data Protection Supervisor.