Which search is implemented with an empty first-in-first-out queue?1 pointDepth-first searchBidirectional searchNone of the mentionedBreadth-first searchOther:

The search implemented with an empty first-in-first-out (FIFO) queue is Breadth-first search (BFS).

Explanation:

1. Definition: BFS is an algorithm for traversing or searching tree or graph data structures. It starts at the root (or an arbitrary node in the case of a graph) and explores all its neighboring nodes before moving on to the next level of nodes.

2. Queue Usage: BFS utilizes a FIFO queue to keep track of nodes that need to be explored. When a node is visited, its children are added to the queue. The algorithm processes nodes in the order they were added to the queue, ensuring that all nodes at the present depth are explored before moving on to nodes at the next depth level.

3. Comparison with Other Searches:

   • Depth-first search (DFS) uses a stack (LIFO) rather than a queue.
   • Bidirectional search involves two simultaneous searches from the start and goal nodes but does not specifically use a FIFO queue arrangement.
   • The option "None of the mentioned" and "Other" are irrelevant in this context.

Conclusion:

Thus, the correct answer is Breadth-first search.