Discussion
Which control governs the glow plug period?
Answer: D
Glow time is shortened as the engine warms and afterglow continues briefly to reduce smoke and noise. Continuous operation would burn the plugs out. Simple older systems did use a fixed period, which makes the second option historically real. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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