The preorder traversal of a binary search tree is 15,10,12,11,20,18,16,19. Which one of the following is the postorder traversal of the tree?
1. 10,11,12,15,16,18,19,20
2. 11,12,10,16,19,18,20,15
3. 20,19,18,16,15,12,11,10
4. 19,16,18,20,11,12,10,15
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