When applying for US Passport Form DS-11, What should be mother's name? FullName at birth or use just LastName at birth?

I am a US Citizen and want to apply for US Passport. In DS-11 Application form section 10. Parental Information is asking for Mother's Name. Whats the right name? 1. Mother's FullName at birth? i.e Mothers' name + Mothers' FatherName as middle name and Maiden LastName as last name. Or 2. Mother's Name + Mother's HusbandName as middle name and Mother's Husband LastName as last name. Or 3. Mother's Name + Mother's HusbandName as middlename and Mother's Maiden LastName as last name. Please let me know. Thank you for your time and help.