What is a visa in the context of international trade?

In the context of international trade, a visa is not traditionally associated with export licenses or limiting product amounts. Instead, a visa usually refers to a travel document that permits someone to enter a foreign country for specific purposes, which aligns with option D.

In international trade, particularly concerning the movement of goods rather than individuals, the term "visa" often refers to endorsement or license requirements that countries impose on products to ensure compliance with trade regulations. Such licenses can be necessary for managing the quality or quantity of exports, but they do not directly equate to the term "visa."

Understanding these aspects can clarify the significance of documentation in international trade, where proper licensing and permits play a crucial role in compliance and regulation. However, viewing the correct choice solely as an export license that limits product amounts may lead to confusion about the broader meaning of visas in trade agreements or export controls.