According to NFPA 25, what should be inspected annually for spare sprinklers?

The correct choice highlights the importance of ensuring that the proper type and number of spare sprinklers are available for use. NFPA 25 emphasizes the need for a sufficient supply of spare sprinklers that match the specifications of those installed in the system. This is crucial because in the event of a sprinkler failure or damage, it is essential to have replacements that are compatible in terms of type, performance, and operational characteristics to maintain effective fire suppression.

By inspecting the type and number of spare sprinklers annually, technicians can confirm that they meet the same standards as those in service and that there are enough on hand to address potential emergencies. This proactive measure helps ensure that the fire protection system remains reliable and ready to function effectively when needed.