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0. The preorder traversal of a binary search tree is 15, 10, 12, 11, 20, 18, 16, 19 . Which one of the following is the post order traversal of the tree?
11, 12, 10, 16, 19, 18, 20, 15
20, 19, 18, 16, 15, 12, 11, 10
10, 11, 12, 15, 16, 18, 19, 20
19, 16, 18, 20, 11, 12, 10, 15
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Post order: 11, 12, 10, 16, 19, 18, 20, 15