Question 10 5 pts Suppose that the federal government introduces a policy that any school with at least 50% of students whose parents are below the poverty line receives free and reduced-price lunches. Schools with less than 50% of students whose parents are below the poverty line do not receive the free and reduced-price lunches. Based on this policy, what research design would you recommend implementing to examine the impact of the program on student test scores? ' Regression discontinuity design " Difference-in-differences ' Instrumental variables " Both (b) and (c)