From PTAs to Economic Union

A customs union involves the adoption of a common external tariff on goods traded with non-member countries, while a free trade area does not. (correct)

A customs union and a free trade area are the same thing.

A free trade area involves a high degree of economic integration and cooperation between member countries, while a customs union does not.

A free trade area involves the free movement of goods, services, capital, and people between member countries, while a customs union does not.