Visiting the left subtree, then the node, then the right subtree is called:

Question

BlackTom AI · Accepted Answer

To approach the question, we examine what each traversal order does in a binary tree.
Option 1: In‑order traversal. This sequence visits the left subtree first, then the node itself, and finally the right subtree, which matches the described order exactly. It is a standard depth-first traversal pattern and is especially notable for producing sorted order of keys in a binary search tree, though that sorted property is specific to BSTs rather than all binary trees.
Option 2: Pre‑order traversal. In pre‑order, the node is visited before any of its subtrees (left then right). Since the description specifies visiting the left subtree, then the node, then the right subtree, this option does not align with pre‑order, making it incorrect for the given sequence.
Option 3: Post‑order traversal. Here, both subtrees are visited before the node itself (left, right, then node). The required sequence of left, node, right is not satisfied by post‑order, so this choice is not a match.
Option 4: Level‑order traversal. Level order is a breadth‑first approach that visits nodes level by level from top to bottom and left to right within each level, not the left-root-right pattern described. Therefore, this option is inconsistent with the specified visiting order.

Visiting the left subtree, then the node, then the right subtree is called:

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