During off-peak hours, a security analyst observes a significant increase in system resource utilization that is atypical for the observed timeframe. To ascertain if this is indicative of a security incident, what is the BEST action for the analyst to take?
Perform immediate updates to the system's antivirus software and initiate an in-depth scan.
Investigate potential unauthorized physical interactions with the affected system.
Reconfigure the system's settings to lower the overall resource usage thresholds.
Inspect the history of executed processes and compare with established operational baselines.