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The primary responsibility of a joint controller under the General Data Protection Regulation (GDPR) is to determine the purposes and means of processing together with other controllers. In a joint controller scenario, multiple controllers collaborate to decide how personal data will be processed and for what purposes. This necessitates a clear understanding and agreement between the controllers on their roles and responsibilities concerning data processing activities.

This collaborative approach to data processing ensures that all parties involved are aware of their obligations and the legal basis for processing the data. Furthermore, it emphasizes the importance of transparency and accountability, as joint controllers must also communicate with data subjects regarding how their data will be managed.

While other options mention various roles and responsibilities, they do not accurately reflect the fundamental nature of joint controllers in the processing of personal data under the GDPR framework.