Discussion
Which handling precaution applies to plastic optical fibre?
Answer: C
A tight bend or a dirty end face attenuates the light and the link fails. The last option states both precautions explicitly, which makes it a correct and fuller version of the same answer. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking which component actually carries the load settles most questions of this kind at once.
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