Iron Man and his wife, Pepper, have been married for five years. Hulk, who is 18 years old and unrelated to Iron Man and Pepper, has been living with Iron Man and Pepper for the last two years. In May of 2019, Iron Man and Pepper divorced. Iron Man and Hulk stayed in the home and Pepper moved out. During 2020, Iron Man provided all of Hulk's support, and Hulk lived in the home for all of 2020. Hulk did not earn any income during 2020. What is Iron Man's most favorable filing status for Year 2?Most favorable filing status?