請教：A complex case with question on I-539

請教：I have read Pjiang's blog about I-539, but I have a complex case here for more help. Thank you for sharing or advising.

I am applying for H-1b, and will include my hu*****and and my kid.

My hu*****and entered U.S. with H-1b 7 years ago, but I came with F-1. In 2007 he changed to F-2. After the approval of F-2, he still submitted both 140 and 485 together with application for EAD. He did use EAD till it expired. His I-140 application was rejected.

I did not join him in applying for GC, luckily. However, I did not report my hu*****and's GC application or use of EAD to the OIS at my school (I did not know I should). Later I renewed my I-20 together with my hu*****and's. So in recent two years, he has been on F-2.

Please look at Qg in Part 4:

"g. Have you, or any other person included in this application, been employed in the U.S. since last admitted or granted an extension or change of status?"
你或任何申請人有沒有在上次延期或更改身份之後在美國工作過？

My Qs:
1. Should I answer YES?

2. If yes, should I report his working experiences while he held H-1b AND while using his EAD after he got F-2?

3. May I talk with the OIS, telling them the whole story, and ask for their help?

4. Was my hu*****and ever in OOS?

Any reply is appreciated.