question on tree traversal

The answer for the following question is given as postorder...
Q)One can convert a binary tree into its mirror image by traversing it in
Can anyone plz let me know the explanation
*This could be completely wrong I haven't used binary trees before*

Sounds to me like you convert to non-binary reverse then convert back to binary.

Have you read up about tree traversal?

Tree traversal


And there are even video on, e.g.

Post order Traversal

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