In October 2019, Jeff and Susan separated and have not lived with each other since, but they are still legally married. They do not file a joint return. Susan supports their children after the separation and pays the cost of maintaining their home. Susan's filing status in 2019 and 2020 is, respectively, Select one: a. head of household and single. O b. single for both years O c. married filing separately for both years. O d. married filing separately and head of household