What should be done to respond to a security incident related to application assignments?

The most appropriate response to a security incident related to application assignments is to review the application assignment errors. This step is crucial because it allows you to understand the nature and scope of the incident. By examining the errors, you can identify what specific application assignments may have been incorrectly configured or may pose a security risk.

This analysis helps in determining whether there was an error in the assignment process, a misconfiguration that led to unauthorized access, or whether there are other underlying issues that need to be addressed. Understanding these details is vital before taking further action, such as notifying users or changing security settings, as it helps ensure that subsequent measures are informed and targeted effectively.

Other options, while they may seem relevant in a broader context, do not prioritize immediate investigation and understanding of the underlying issues that caused the incident, which is essential for an effective response and mitigation strategy.