Alison and her husband, Tyrone, were married at the beginning of 2021. They separated on July 5, 2021, and Tyrone moved out of the house at that time. Their son, Cam (9), lived with Alison all year. Alison paid more than half of the total cost of keeping up the home in 2021. Alison and Tyrone's divorce was finalized on January 3, 2022. Alison does not wish to file a joint return with Tyrone. What is Alison's most advantageous 2021 filing status and standard deduction