Which of the following are requirements for determining a taxpayers eligibility for claiming the Joint Custody Head of Household credit? Select one: a. The taxpayer was unmarried at the end of the tax year, or if married/RDP, they lived apart from their spouse/RDP for all of the tax year and they used the married filing separate/RDP filing status b. The taxpayer provided more than one-half the household expenses for their home that also served as the main home of their child, step-child or grandchild for at least 146 days but not more than 219 days of the taxable year c. A custody agreement for the child has not yet been approved and nothing concerning the matter has been placed in writing d. Both A and B above