2. Given the binary tree on the right-hand side.What is the result of post order traversal?
(A) 8, 31, 35, 47, 61, 83, 84, 91, 96, 49
(B) 31, 8, 47, 35, 61, 83, 91, 96, 84, 49
(C) 31, 61, 8, 47, 83, 91, 96, 84, 35, 49
(D) 8, 31, 35, 47, 49, 61, 83, 84, 91, 96
(E) 31, 61, 91, 8, 47, 83, 96, 35, 84, 49