Which of the following is a mitigation response available to law enforcement?

The chosen answer highlights a critical role that law enforcement plays in addressing insider threats: conducting investigations and making arrests. When there are indications of insider threats—such as theft of sensitive information, unauthorized access to systems, or other illegal activities—law enforcement agencies have the authority and resources to investigate these incidents, gather evidence, and take appropriate legal action against the perpetrators. This includes pursuing criminal charges, which serves as a deterrent to others who might consider similar actions.

The other options, while important in their own contexts, do not directly pertain to the specific actions law enforcement can take regarding insider threats. System upgrades are more about strengthening security measures to prevent incidents rather than responding to them. Employee training targets preventive measures for potential insider actions by educating workers about security policies and recognizing suspicious behavior but is not a direct response to incidents once they occur. Inventory management focuses on the oversight and control of physical and digital assets, ensuring that resources are accounted for and secure, which, while relevant in security settings, does not encapsulate the law enforcement response to insider threats.