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The technique being used is recurrence control, which focuses on preventing nonconforming products from reoccurring after a corrective action has been implemented. This involves not just addressing the immediate issue but also examining the underlying causes to ensure that similar problems do not happen in the future. Recurrence control aims to establish processes, checks, or improvements that will help maintain compliance and uphold quality standards over time.

In contrast, design verification is a process that ensures a product meets its design specifications and requirements before moving forward in production. Process mapping is a tool used to visualize and understand the steps involved in a process, which can help identify inefficiencies or areas of concern but does not directly address corrections after a nonconformity. Similarly, process auditing involves systematically reviewing processes to check for compliance and effectiveness but does not specifically focus on implementing corrective actions associated with nonconforming products.

Therefore, the team's action of investigating and correcting the cause of nonconformity aligns with the concept of recurrence control, as it aims to ensure that identified issues do not recur in future iterations of the product or process.