Discussion
What is beam search?
Answer: C
Beam search bounds the frontier to a fixed width, discarding everything else, which makes memory constant and the search fast but sacrifices both completeness and optimality. It is widely used in speech recognition and machine translation where an approximate answer quickly is worth more than a guaranteed one slowly. The other options describe no standard algorithm. Trading guarantees for a fixed resource budget is often the right decision when the budget is hard and the guarantee is soft.
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