3. Leon died on August 23, 2008, and his wife Mary has not remarried. Since her husband's death, Mary has maintained a home for her two dependent children, who were ages 7 and 4 when their father died. Which of the following describes Mary's filing status for 2009,2010 , and 2011 ? a. Surviving spouse for 2009,2010 , and 2011 b. Surviving spouse for 2009 and 2010 ; head of household for 2011 c. Head of household for 2009,2010 , and 2011. d. Surviving spouse for 2009 ; head of household for 2010 and 2011