Which senteced is punctuated correctly

Nate took the dog out for a walk, before he did his homework.

Explanation:

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The one you have selected is the correct answer!

Before Nate did his homework, he took the dog out for a walk.

Explanation:

The second sentence has too many commas. The correct punctuation for the third and fourth sentences would be: Nate took the dog out for a walk before he did his homework.

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