In 2020 Melissa is 27 years old and is a full-time PhD student at a private university. She lives at home with her parents, who provide over half of her support. Her only income for the year was $5,500 from a part-time job at the university's bookstore. What is Melissa's filing status for 2020? She is not allowed to file a tax return because her parents can claim her as a dependent O Head of household O This question cannot be answered without knowing her parents' AGI O None of these is correct