Discussion
Which structure does forward chaining most naturally build?
Answer: D
Forward chaining keeps asserting conclusions into working memory until the rules are exhausted, so what accumulates is a set of derived facts. The goal-rooted proof tree belongs to backward chaining, frontiers to search and dependency networks to truth maintenance. Because everything derivable is derived, forward chaining can do a great deal of irrelevant work when only one conclusion was wanted. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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