Final answer:
Sprinklers used in a deluge system have their operating elements removed, unlike sprinklers in other fire suppression systems. This allows for simultaneous water delivery to all sprinklers when the system is triggered.
The correct option is D.
Step-by-step explanation:
The question relates to the specifics of sprinklers used in a deluge fire suppression system. These sprinklers have a unique attribute compared to sprinklers used in other types of fire suppression systems. The correct answer is D. Have their operating elements removed.
This is because deluge systems are designed to deliver water or another extinguishing agent to all open sprinklers simultaneously once the system is activated.
They do not have individual activation mechanisms like other sprinkler systems and are typically used in high-hazard areas where rapid fire spread is a concern.
The operating elements refer to components like a heat-activated glass bulb or solder link found in other types of sprinklers, which when heated, trigger the sprinkler to release water.
The absence of these elements means the sprinklers are in an 'open' state, and only the activation of the deluge valve causes water to flow.
The correct option is D.