Tư tưởng Hồ Chí Minh về thời kỳ quá độ lên chủ nghĩa xã hội ở Việt Nam

Which of the following policies is an example of a command-and-control policy? a. subsidies to education b. maximum levels of pollution that factories may emit c. tradable pollution permits d. none of the above is an example of a command-and-control policy.