An A* algorithm is a heuristic search technique which
(A)
is like a depth-first search where most promising child is selected for expansion
(B)
generates all successor nodes and computes an estimate of distance (cost) from start node to a goal node through each of the successors. It then chooses the successor with shortest cost
(C)
saves all path lengths (costs) from start node to all generated nodes and chooses shortest path for further expansion.
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