Which of the following must be checked during an annual inspection of an automatic sprinkler system?

During an annual inspection of an automatic sprinkler system, it is essential to assess multiple components to ensure the system operates effectively in an emergency situation.

One of the key aspects is the condition of the sprinkler heads. These heads need to be evaluated for any signs of damage, corrosion, or blockage since compromised sprinkler heads can significantly reduce the system's effectiveness.

Another crucial element is the functionality of the alarm system. The alarm system plays a vital role in alerting occupants of a fire and initiating emergency response. If this system is not functioning correctly, it could lead to delayed response times and increased risk during a fire event.

Lastly, checking the pressure in the system is critical. Proper pressure ensures that the water can be delivered effectively throughout the system during an incident. Insufficient pressure could mean that the sprinkler system will not operate as designed.

Given that each of these elements plays a pivotal role in the overall efficacy and reliability of the sprinkler system, it is necessary to check all of them as part of a comprehensive annual inspection. Therefore, the correct choice encompasses all aspects mentioned.