What is the difference between command-and-control policies and market-based policies toward externalities? a. Command-and-control policies provide incentives for private decisionmakers to solve the problems on their own, whereas market-based policies regulate behavior directly. b. Command-and-control policies rely on taxes, whereas market-based policies rely on quotas. c. Command-and-control policies regulate behavior directly, whereas market-based policies provide incentives for private decisionmakers to change their behavior. d. Command-and-control policies are efficient, whereas market-based policies are inefficient.