Which of the following is not correct? a. A negative income tax only applies to working people, so it encourages people to get full-time work. b. An advantage of a negative income tax is that it is not based on the number of children, so it does not provide incentives for unmarried women to have children. c. Supporters advocate the use of the Earned Income Tax Credit as a way to help those with lower levels of income. d. A negative income tax subsidizes the incomes of people with lower levels of income