F2 to H4 application filing form i539 questions

Hi, I’m on F-2 dependent visa and recently my husband H1 approved so I started application to file my H4. I have few questions on form I539 that I’m using to file for H4 so can someone address the questions please.
Q15.b Expiration date (mm/dd/yyyy)
what should be expiration date ?
Q 16 Select this box if you were granted duration of staus (D/S)
What is duration of status ? should I select the box or not ?
Part 3
Q 2.a Is this application based on an extension or change of status already granted to your spouse, child or parent ? Yes or No options
Should I select Yes or No ?
Q 3.a Is this application based on a separate petition or application to provide your spouse, chile or parent an extension or change of status ?
Options are - Yes, filed with this form I-539 or No
Part 4
Q 14 Have you or any other person included in this application been employed in the US last admitted or granted an extension or change of status
Yes Or No
What should I answer for Q 14 ?

Thank you for your time.

Hi @Pujitha

Check this sample i539 form for H4 visa. It has answers to all your questions with sample form.

Thank you @Anil.Gupta