6. pass the following tree's root and 16 to the following function and explain what does the following function do and returns? struct treenode* q6(struct treenode* root, int x) { if (root == null) return null; if (root-> data > x) { struct treenode* tmp = q6(root-> left, x); if (tmp == null) return root; else return tmp; } else return q6(root-> right, x); }