Which of the following activities falls under the licensing provisions for servicing fire extinguishers?

The activity that falls under the licensing provisions for servicing fire extinguishers is service conducted by trained personnel from the same firm. The licensing requirements are in place to ensure that individuals who service fire extinguishers have the proper training and knowledge to perform tasks such as inspection, maintenance, and recharging. This ensures that the extinguishers function correctly in emergencies, contributing to safety standards and compliance with regulations.

While manufacturers may perform installation, this activity is typically exempt from licensing because it is part of their production responsibility. Non-licensed volunteers conducting inspections do not meet the necessary qualifications mandated by regulations, which is important in maintaining the integrity and reliability of fire safety equipment. Similarly, sales activities by retail establishments do not involve servicing, which is the primary focus of licensing provisions. Thus, the correct response emphasizes the importance of trained and licensed personnel performing service tasks to ensure safety and compliance.