6. The following functions are available template?class Item > 2. int height (const binary_tree_nodeItem temp) int h= if (temp != NULL) { 6. int 1_height-height (temp - left)); int r height -height (temp - right)) int max_height-std: :max (1_height, r_height); hmax_ height + 1; 18 return h 12 1. template class Item> 2. int diff (const binary_tree_node binary-tree-nodeItem * balance (binary-tree-node Item>*& temp) int bal_factor-diff(temp); if (bal-factor > 1) { if (diff(temp-> left()) > ?) else 1. else if (bal_factor