收到USCIS的I-485, RFE原文如下：
Submit a copy of your birth certificate showing your parentage, which has been registered with the proper civil authorities of the country of your birth.
这句话有些搞不懂。我想大概有两种理解：
1. Submit a copy of your birth certificate; the cetificate should show your parentage and also is issued by an agency that has been registered with the proper civil authorities of the country of your birth.
2. Submit a copy of your birth certificate that shows your parentage; and your parentage should has been registered with the proper civil authorities of the country of your birth.
应该是哪种呢？如果是前一种，我想提供国内市级公证处出示的出生公证书应该可以了。如果是后一种，难道还要提供父母的户口或其他资料。或者还有其他理解？实在费解，望各位指教。