Which of the following is not correct? a. 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. b. A negative income tax subsidizes the incomes of people with lower levels of income. 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 only applies to working people, so it encourages people to get full-time work