[A] A sort of bilateral trade where one set of goods is exchanged for another set of goods and a seller provides a buyer with deliveries.
[B] A company takes full responsibility for making its goods available in the target market by selling directly to the end-users.
[C] The companies in two separate sovereigns agree to exchange one set of goods for another set of goods.
[D] A set of multilateral trade where one of goods and services may be exchanged for another set of goods and services among the trading partners.