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Best-First search is a type of informed search, which uses ________________ to choose the best next node for expansion.

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Best-First search is a type of informed search, which uses ________________ to choose the best next node for expansion.

(a) Evaluation function returning lowest evaluation

(b) Evaluation function returning highest evaluation

(c) Evaluation function returning lowest & highest evaluation

(d) None of them is applicable

I had been asked this question in semester exam.

This interesting question is from Informed Search and Exploration topic in chapter Problem Solving of Artificial Intelligence

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The correct option is (a) Evaluation function returning lowest evaluation

Best explanation: Best-first search is an instance of the general TREE-SEARCH or GRAPH-SEARCH algorithm in which a node is selected for expansion based on an evaluation function, f (n). Traditionally, the node with the lowest evaluation is selected for expansion, because the evaluation measures distance to the goal.

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