A private company has establishments in France, Poland, the United Kingdom and, most prominently, Germany, where its headquarters is established. The company offers its services worldwide. Most of the services are designed in Germany and supported in the other establishments. However, one of the services, a Software as a Service (SaaS) application, was defined and implemented by the Polish establishment. It is also supported by the other establishments.
What is the lead supervisory authority for the SaaS service?
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