請較大俠

我和先生是485pending身份,想邀請我的父母來美國.填I-134時有一項不知道怎麽填
If you are not a native born United States citizen, answer the following as appropriate:
a. If a United States citizen through naturalization, give certificate of naturalization number
b. If a United States citizen through parent(s) or marriage, give citizenship certificate number
c.If United States citizenship was derived by some other method, attach a statement of explanation.
d.If a lawfully admitted permanent resident of the United States, give "A" number
先謝了!!!!

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