Discussion
Which precaution applies when handling a halogen bulb?
Answer: C
Skin oils create a hot spot on the quartz that devitrifies and cracks it, so the bulb is held by its base. Allowing a bulb to cool genuinely is sensible, which makes the last option a real if lesser precaution. Cleaning with alcohol rescues a touched bulb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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