6. Which of the following statements about fiscal incidence is correct? a. Fiscal incidence studies are unable to separate between variances in costs and the quality of offering a service to diverse communities b. Fiscal incidence studies are capable of separating between variances in costs and the quality of offering a service to diverse communities c. The means test for social grants has no incidence on labour force participation or saving for retirement. d. During apartheid, groups were not treated as fiscally autonomous units, implying that taxation paid by members of a racial group should not also be used to fund public expenditures benefiting that group