Discussion
Which additional valve does a monitored system contain?
Answer: D
Sealing the vent lets the controller pressurise or evacuate the system for a leak test. The last option explains exactly that purpose, which makes it a correct and more instructive version. Relief valves genuinely exist too. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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