Discussion
Which strategy stops a rule firing repeatedly on the same data?
Answer: B
Refractoriness removes an instantiation from the conflict set once it has fired, so the same rule with the same bindings cannot loop forever. Without it, a rule whose action does not change its own conditions would fire endlessly. Recency, specificity and file order address different questions. It is the least visible of the strategies and the one whose absence is noticed immediately.
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