Discussion
Which treatment protects battery terminals from corrosion?
Answer: A
A non conductive grease applied after tightening excludes the acid vapour that causes the white deposit. Any grease applied before tightening would reduce the contact area. Copper grease is for threads rather than terminals. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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