101.
What is the initial frontier of a search?
Answer: A
Search begins with the root node on the frontier and everything else unexplored, and the first expansion produces the successors of the initial state. Starting with the successors would skip the goal test on the root, which matters when the start is already a goal. The whole space is never materialised and the goals are not known in advance. Beginning from a single node and growing outward is what makes the algorithm applicable to spaces too large to enumerate.
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