Artificial intelligence
Which of the following algorithm is online search algorithm?

Breadth-first search algorithm
None of the mentioned
Depth-first search algorithm
Hill-climbing search algorithm

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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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