Free trade between countries shifts a country's domestic production. Which of the following is true regarding the impact of free trade on a country's production possibility frontier?

A) It moves domestic production from below the production possibility frontier to on the production possibility frontier.
B) It has no effect on a country's production possibility frontier.
C) It moves domestic production from on the production possibility frontier to below the production possibility frontier.
D) It moves domestic production from above the production possibility frontier to below the production possibility frontier.