父母辦GC, 485表part2填第幾項目啊. 請幫忙

我拿到了公民, 準備給來探親的父母辦綠卡. 準備130和485一起交.

485表第二部分, 申請的原因, 是選第一項嗎?

Part 2. Application type. (Check one.)

a. an immigrant petition giving me an immediately available immigrant visa number has been approved. (Attach a copy of the approval notice, or a relative, special immigrant juvenile or special immigrant military visa petition filed with this application that will give you an immediately available visa number, if approved.)

還是應該選h. 填寫其他原因(兒子是美國公民).

另外130表上, A#, 公民還要填嗎?

先多謝了.