The tree given is as follows:
30
/ \
12 45
\
18
Insert: 10,15,40,20,22
Which one of the following is the postorder traversal of the resultant tree?
(A) 10,15,13,20,22,30,45,40,18
(B) 10,15,12,20,30,22,45,40,18
(C) 10,15,12,20,30,22,45,18,40
(D) None of these