Discussion
Which practice prevents sulphation?
Answer: D
Sulphation proceeds while a battery sits discharged, so a maintenance charger or periodic charging preserves it. Disconnecting the terminal does stop the drain, which makes the last option genuinely helpful though not sufficient on its own. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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