AP - "Class of Admission"?

I am renewing my AP and asking help for filling "Class of Admission" on form 131.

My status:
I appplied EAD and AP last year, and got both of them. Did not use AP, but used EAD for current job(I was on H1B before EAD).

Should I put down "AOS" or "H1B"?

My hu*****and' attorney used "H1B" for him, and he never used EAD.

Thanks,