Question: What does it mean for A * search to be optimally efficient? A . A * expands the fewest nodes possible, regardless of the heuristic

What does it mean for A* search to be optimally efficient?
A. A* expands the fewest nodes possible, regardless of the heuristic used
B. A* expands the fewest nodes necessary to guarantee the optimal solution, given an admissible and consistent heuristic
C. A* is guaranteed to expand only the nodes that lead directly to the solution
D. A* always finds the closest goal

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