For the binary tree given below, find the sequence of nodes, if the binary tree is traversed in postorder traversal. 30 20 40 15 25 35 50 5 60 18 45 A 5 15 18 20 25 30 35 40 45 50 60 B 5 18 15 25 20 35 45 60 50 40 30 5 18 15 20 25 35 45 60 50 40 30 D 5 18 15 20 25 35 50 45 60 40 30