The audio version of the poem allows the listener to perceive the lack of rhyme and meter, as a way of showing Whitman's disdain for conformity and tradition.
In this case, the last answer option is the correct answer.
We can arrive at this answer as follows:
The poem shows the recognition of the human being with himself and the association of human life with nature. For the poet, this recognition does not need rules and conformity, but freedom, just like the form of the poem.
This attitude of the poet can be seen even in the structure of the poem, which is inconstant and diversified, not assuming any kind of pattern.
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