回复：多谢美西游子，485pending4yrs, sdfsdfsdff,gcprisoner, 请再确认一下：Approval

I-797 itself is just a form USCIS uses to send out notice, it can be anything of their action upon the case, receipt notice, approval notice or even denial, so you need to read the content of the form, it can be A, B, C, ...