Discussion
What is a minimal unsatisfiable subset?
Answer: D
When a model is found to be unsatisfiable, isolating a small group of constraints that are already contradictory tells the modeller where the error lies far better than a bare failure. Removing any one of them would restore satisfiability. The other options describe different sets. A tool that explains a negative result, rather than merely reporting it, is what makes debugging a large model tractable at all.
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