Discussion
What is a dead end in a search space?
Answer: C
A dead end is a state from which the goal cannot be reached, either because it has no successors or because everything beyond it is also unproductive. Depth first search must explore it fully before backtracking, which is why detecting dead ends early is valuable. Expanded states, depth limits and cost bounds are different notions, though a cost bound produces a similar effect. Recognising futility before spending effort on it is what pruning techniques are for.
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