Which of the following actions is first recommended when responding to an insider threat incident?

When responding to an insider threat incident, the first recommended action is to contain the threat. This step is crucial because it aims to stop any ongoing malicious activities or prevent further damage to the organization's systems and data. By containing the threat, the organization minimizes potential risks and protects sensitive information from being compromised or exploited further.

After containment, it would be essential to document the incident thoroughly, notify law enforcement if necessary, and analyze system logs to gather evidence and understand the nature of the threat. However, addressing the immediate threat is priority, as it ensures that the situation does not escalate or lead to greater security breaches.