Xiaobaitu, TwoCents, please help!

Could you please tell me what is the answer to the question #15 in EAD application form? The question is: "Current Immigration Status".

My situation is: My I485 is pending. I am using EAD now. Since my EAD is going to expire in August, I want to submit the application to renew it. My status was H4 before I started to use EAD.

Should I fill in "H4", or "AOS", or "I485 spending" for the above question?

Thank you very much.