Suppose a LinkedList tokens contains " x","","+","28,"+" (in that order). To what binary tree does root point after the following code is executed? Stack stk - new Stack (); for (String token ; tokens) If (1"+ ", equols (token)) stk.push (nek treekode (token, nu11, nu11)): else 7reeNode node2 =2tk,pop(1): TreeNode node1 = stk, pop (): stk.push (new FreeNode (token, node1, node2))