Discussion
How is the solution path recovered once a goal node is found?
Answer: B
Each node stores the node it was generated from and the action that produced it, so the path is read off by walking up the chain and reversing it. That is the whole reason nodes carry parents rather than being bare states. Replaying, backward search and the explored set order would all be more expensive or incorrect. A small amount of bookkeeping per node, chosen so that the required output can be reconstructed, is a general design pattern. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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