In N400 USCIS application, what can be used as child support evidence …

In N400 USCIS application, what can be used as child support evidence for a child resides with us? I am applying for N400 US citizenship online, after having Green Card for 5 years. My child is 3 years old (US citizen) and resides with me and my wife. At some point the application requires me to provide evidence that I am supporting my child.

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