1. If the heuristic being used is the-number-of-tiles-out-of-place, which of the following eight-puzzle will be given priority for further consideration by a heuristic search? (x =-no tile) A.12 3 B.x 2 3 C.1 3 x 4 2 6 47 87 5 8 D. x 1 3 4 2 6 7 5 8 4 5 x 1 5 6 7 86 2. Which of the following is an example of procedural knowledge? a. Knowing the rate of growth of the world's population b. Knowing how to tie your shoes C. Knowing your name d. Knowing the exchange rate of different national currencies 3. The diagram below represents an associative memory as described in the text. What stable state will the system reach if it is initiated with the top and bottom neurons excited and the others inhibited? -1 a. All neurons excited c. No neurons excited neurons excited b. d. Only the side neurons excited Only the top and bottom