Haha, I bet someone will try to choose 'all of the above' just to be safe! But seriously, I'd go with B and F - a new classifier that already classifies the object is just asking for trouble.
I agree with Jacquelyne. B and D seem like the most obvious choices here. Although C might also cause issues if the old and new classifiers are the same.
I think B and D are the correct answers. Trying to reclassify an object with an abstract class or without any new classifiers would definitely cause errors.
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