I-131 Question, Please Help!

[books12345]

What should I write in 'Class of Admission' ?? F1 OR H1B OR WHAT??

Entered U.S. on a student visa (F1), currently on H1B.
Student Visa already expired (but got converted to H1B during OPT).
H1B is valid but never left U.S. to get it stamped, hence I do not have H1B visa stamp on my passport. I have a valid 1-94 and H1B approval notice.

Thanks

 

[PraetorianXI]

Student F-1. That is how you were admitted.

 

[books12345]

I really appreciate your help. Thanks a lot!