To examine factors affecting female labour supply, a group of economists collected individual data from a survey on labour force participation, which included information on whether a woman is in the labor force (inlf = 1 if the woman reports working for a wage outside the home, and zero otherwise), years of education (educ), past years of labor market experience (exper), family income (income), whether having children less than six years old (kids), and whether living in a city or not (urban). Which of the following models would best allow you to test whether the impacts of having children less than six years old on the likelihood of participating in the labour force are equal for women living in cities and women living in rural areas. Select one: O a. inlf = Bo Beduc Bzexper Bzincome Bakids * urban Bskids Bourban u O b. inlf = Bo Bieduc Brexper Bzincome Bakids Brurban u O c. inlf = Bo Beduc Bzexper Bzincome Bakids * urban Burban u O d. inlf = Bo Beduc Bexper Bzincome Bakids * urban u