Trace a stack (called S) through the following operations: Stack S = new Stack(); S. push(new Integer(2)); S. push(new Integer(7)); Integer X = S.pop(); S. push(new Integer(8)); S. push(new Integer(5)); Integer X = S.pop(); Integer Y = S. peek(); S. push(new Integer(3)); Integer Z = S.pop(); Give the contents of the stack after this code has been executed. Indicate the elements in order and label the top