Hmm, I'm not sure about the difference between the Must keywords being required to detect the topic versus functioning as positive features. I'll need to think about that a bit more.
I'm pretty confident that the keywords are not ignored, since the question specifically mentions keyword-based topic detection. That rules out option D.
Okay, let's think this through. The question is asking about the impact of keywords when using machine learning, so I'm going to focus on that and try to eliminate the options that don't seem to fit.
This question seems straightforward, but I want to make sure I understand the concepts of keyword-based and model-based topic detection before selecting an answer.
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