Which of the following is essential for maintaining automatic sprinkler system functionality?

Regular inspections are indeed crucial for ensuring the functionality of automatic sprinkler systems. These inspections typically involve checking the system's components, ensuring that they are all operational, and verifying that there are no obstructions or issues that could hinder the system's effectiveness in the event of a fire. Routine inspections help identify wear and tear, corrosion, or other potential problems before they lead to system failure, thereby maintaining compliance with safety regulations and ensuring that the system will function optimally during an emergency.

While actions like repainting, cleaning, and testing might play roles in overall maintenance practices, they do not replace the necessity of regular inspections, which are systematically required to maintain the integrity and functionality of the sprinkler system. Through proper inspections, other necessary maintenance actions can also be identified and scheduled, making them integral to the preventive maintenance strategy.