What is defined as a predefined approach for responding to security incidents?

The correct choice is defined as an incident response plan, which serves as a structured and organized approach to managing and responding to security incidents. Such an approach is critical because it ensures that security teams are prepared to handle incidents efficiently and effectively, minimizing damage and recovery time.

An incident response plan typically includes guidelines on how to identify, investigate, and analyze incidents, as well as protocols for communication, roles and responsibilities of team members, and procedures for documenting the incident and the response. This plan not only helps organizations mitigate the impact of incidents but also facilitates learning from each event to improve future incident response efforts.

In contrast, risk management focuses on identifying, assessing, and prioritizing risks, which is broader than just responding to incidents. A security audit involves evaluating the security posture of systems and processes to ensure compliance with standards, which is not specifically about incident response. Lastly, a data processing agreement outlines how data is handled between parties, which again does not address incident response strategies directly. Thus, the incident response plan is the most appropriate choice for defining a predefined approach for responding to security incidents.