The auditor's best recommendation is D. Introduce problem management into incident response. Problem management is a practice that aims to identify, analyze, and resolve the root causes of recurring incidents, and prevent or reduce their impact in the future1. Problem management can help improve the resolution times for recurring incidents by eliminating or mitigating the underlying problems that cause them, and by providing permanent solutions that can be reused or automated2. Problem management can also help improve the quality and efficiency of incident response by reducing the workload and complexity of dealing with repetitive issues2.