The provided log exhibit explicitly states that an "Insecure SSL Connection blocked from 10.0.3.20". Furthermore, the Event Status is listed as "Mitigated". In the context of security event management, "mitigated" signifies that a corrective action has been successfully applied to neutralize a detected threat. In this case, the action was to block the connection, thus preventing the potential risk. The combination of these two details confirms that the security risk was handled and is no longer active.

B: The "Mitigated" status directly contradicts the idea that the risk is "open". An open risk would still require attention and would not be considered mitigated.

C: The log shows a single, low-severity, automatically handled event. There is no information to suggest it was escalated to a formal incident, which is a more significant occurrence.

D: The log indicates a specific connection was blocked. It does not provide evidence that the source host (10.0.3.20) itself was quarantined or isolated from the network.

NIST Special Publication 800-61 Rev. 2, Computer Security Incident Handling Guide: This guide distinguishes between events, adverse events, and incidents. The log shows a mitigated adverse event. Section 3.4, "Incident Response Life Cycle," discusses containment, eradication, and recovery, where mitigation actions like blocking traffic are primary steps. The "Mitigated" status indicates this process was successful for this specific event.

Cisco, Firepower Management Center Configuration Guide: In the context of intrusion and security events, Cisco documentation describes event statuses. An action such as "block" results in the threat being stopped. When a system successfully blocks a threat as per its policy, the event can be considered mitigated, as the immediate danger has been averted.

Palo Alto Networks, PAN-OS® Administrator’s Guide: Threat logs in PAN-OS detail the action taken against a threat (e.g., 'alert', 'drop', 'reset-both'). The "blocked" description in the exhibit is analogous to a 'drop' action, confirming the firewall actively prevented the connection. This preventative action is a form of risk mitigation.