The correct answer is D. Log . In Check Point Threat Prevention, tracking determines what evidence is generated when a rule or protection matches traffic. The official Logging and Monitoring guide states that Log is the default option in the Threat Prevention policy , and that it shows the information the Security Gateway used to match the connection, including at minimum source, destination, source port, and destination port. It also explains that richer session details can appear when the rule includes application or data-type matching.

For IPS protections, this default is operationally important because IPS enforcement without logs would make post-event investigation, false-positive analysis, tuning, and compliance validation much harder. None is specifically documented as the default in Access Control policy, not Threat Prevention. Alert is a stronger notification mechanism but is not the default tracking behavior. UserCheck is an end-user interaction mechanism used in selected blades and scenarios, not the default IPS protection tracking value. The default Log setting gives administrators visibility into IPS matches while avoiding the operational noise of alerting on every event. Reference topics: Threat Prevention Track options, IPS logging, Logs & Monitor, protection match evidence, default Threat Prevention tracking.