Which search implements stack operation for searching the states? A. Depth-limited search B. Depth-first search C. Breadth-first search D. None of the mentioned

The correct answer is: B. Depth-first search.

Depth-first search (DFS) is

an algorithm for traversing or searching a tree or graph. It starts at the root node and explores all of the neighboring nodes before moving on to any other nodes. If a node has no neighboring nodes, it is marked as visited and the algorithm backtracks to the previous node.

DFS can be implemented

using a stack. The stack is used to store the current node that is being explored. When a node is explored, it is pushed onto the stack. When the algorithm reaches a dead end, it pops the top node off of the stack and explores the next neighboring node.

Breadth-first search (BFS) is another algorithm for traversing or searching a tree or graph. It starts at the root node and explores all of the neighboring nodes at the same level before moving on to any other nodes. If a node has no neighboring nodes, it is marked as visited and the algorithm moves on to the next level.

BFS can be implemented using a queue. The queue is used to store the nodes that are waiting to be explored. When a node is explored, it is removed from the queue and the next node in the queue is explored.

Neither A nor D are correct because they are not search algorithms.