Discussion
What is the difference between a state and a node?
Answer: B
A node carries a state together with its parent, the action that reached it, the path cost and the depth, so two different nodes may hold the same state reached by different routes. That distinction is what makes graph search possible and what allows a solution path to be recovered. Storage and goal testing are not the difference. Confusing the bookkeeping structure with the thing it describes causes most of the confusion in first encounters with search.
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