A network administrator is monitoring the health of a server that hosts critical applications. The administrator notices that the temperature of the server's chassis has been gradually rising throughout the day and is now in the upper threshold of the operational limits. What should be the administrator's initial course of action to prevent potential system failure due to overheating?
Immediately reduce the server load by shutting down non-essential applications.
Apply additional thermal paste to the heatsink to better facilitate efficient transfer of heat.
Perform a firmware upgrade on all network devices to optimize performance.
Inspect the server's cooling system for issues such as failed fans or blocked air vents.
Increase the threshold limit in the server's monitoring system to avert alerts.