12. Suppose the search tree below is being constructed to solve the eight-puzzle using the- number-of-tiles-out-of-place as the heuristid 1 1 2 3 4 2 6 7 5 8 4 2 6 7 5 8 7 5 8 What is the heuristic value of each associated node and which node would you pursue ? A. (A)-2 (B)- 2 (C) 4 B. (A) 4 (B) 4 (C) 4 C. (A) 4 (B) 2 (C) 4 D. (A) 2 (B) 4 (C)2 Pursue either (A) or (B) Pursue any of the nodes Pursue (B) Pursue either (A) or (C)