What is the sequence of nodes when applying in-order traversal on the binary tree given below?

1
A, B, C, D, E, F, I, H, G
2
A, C, D, E, B, F, G, H, I
3
A, B, C, D, E, F, G, H, I
4
I, H, G, F, E, D, C, B, A

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