Option b is correct. It is false that depth-first search always expands at least as many nodes as a search with an admission heuristic.
By good luck, depth-first search may occasionally extend fewer nodes than A* search with an acceptable heuristic. For instance, it is conceivable that occasionally, via good fortune, depth-first search may march directly to the objective without making any detours.
A node is the fundamental building block of a data structure like a linked list or tree. Nodes can link to other nodes and also store data. Pointers are frequently used to implement links between nodes.
Tree topologies are frequently formed from nodes. A node is a representation of the data that makes up a single data structure. These nodes might include a value or a condition, act as another independent data structure, or both.
A single parent node serves to symbolize a node. A root node is the highest node in a tree structure; it lacks a parent node but acts as the parent or "grandparent" of all nodes below it in the tree.
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