Sara's Production Possibilities Boards (per week) 10 8 ONO O and and and and and and Sails (per week) 0 4 8 12 16 20 Frank's Production Possibilities Sara and Frank produce boards and sails for windsurfing. The tables show their production possibilities. Each week, Sara produces 4 boards and 12 sails and Frank produces 18 boards and 6 sails. Now, Sara and Frank decide to specialize and trade. The person who specializes in making boards is The person who specializes in making sails is O A. Frank, who produces 30 boards: Sara, who produces 20 sails OB. Sara, who produces boards; Frank, who produces 15 sails OC. Frank, who produces 8 boards: Sara, who produces 20 sails OD. Sara, who produces 30 boards; Frank, who produces 15 sails The gains from specialization and trade are OA. 30 boards and 20 sails B. 8 boards and 8 sails OC. 8 boards and 2 sails OD. 2 boards and 8 sails Sails (per week) and 9 Boards (per week) 30 24 18 12 8 0 3 6 and and and and and 12 15