Which of these items would be counted as a positive contribution to the United States' GDP in 2020 (check all the ones that would be counted)? Select one or more: a. A hair cut received in a salon in Memphis, Tennessee in 2020. b. A painting by Winslow Homer, a 19th- century American painter, which was purchased in 2017 from an art gallery by an avid art collector c. A toiler purchases from Kohler, an American company, by a developer to build a house in Madison, Wisconsin in 2020. d. Tanisha babysits her neighbor's kids in Atlanta in 2020 and receives $40 in cash for it e. Coffee beans purchases by Greg in 2020 to make an expresso coffee at his home