What's "Class of Admission" in AP form?

[oxa1]

I am filing I485 with I765/O131.
In I131 Part 1. 3., how to fill in Class of Admission? I guess it is not INS status, like H1, F1. Should it be (C)(9) (which is the eligibility category in I765)?

Thanks

 

[usnycus]

They are asking about your status (or visa category) when you entered last.

It is H1, L1, F1, B1 or AOS etc.