Discussion
Which consequence follows from a break in an optical ring?
Answer: A
A ring depends on every node passing the signal on, so one break stops everything. The last option explains exactly why, which makes it a correct and more instructive version of the same answer. Naming what changes and what stays the same is the reliable route through questions of this shape. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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