Discussion
What is the relaxed plan heuristic?
Answer: A
Extracting an actual plan for the relaxed problem, and counting its actions, accounts for the positive interactions that the additive heuristic double counts. It is inadmissible, since the extracted plan need not be optimal, but is highly informative and cheap. The other options describe different quantities. A heuristic obtained by solving a relaxation rather than estimating it is more expensive per node and usually repays the cost many times over.
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