Multiple choice In which of the following trees balance factor of each node be either of 1, -1or 0? Threaded tree Lexical ordered binary tree AVL tree None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation AVL trees are self-balancing binary search trees where each node's balance factor (height of left subtree minus height of right subtree) must be -1, 0, or 1. This constraint ensures the tree remains balanced.