Artificial intelligence
Which is true regarding BFS (Breadth First Search)?

BFS is nothing but Binary First Search
The entire tree so far been generated must be stored in BFS
BFS will get trapped exploring a single path
BFS is not guaranteed to find a solution if exists

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Artificial intelligence
An algorithm A is admissible if ___________

It returns more solutions, but not an optimal one
It guarantees to return more optimal solutions
It is not guaranteed to return an optimal solution when one exists
It is guaranteed to return an optimal solution when one exists

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