K2 AOS (form question: do I put the parental K1 USCIS number on 485 form, page2, item 11? Or do I leave it blank since that number was issued for the K1 (parent). Child is 10 years old. I do see that later in the form, there is a distinction between principal and derivative applicants and that part is clear how to fill out.
Thank you for any guidance!