A Customs Union Is

A customs union is

A) the union of countries that have a common trade policy of protectionist measures against other countries.
B) a group of countries that trade freely with each other but have their own individual trade policies with non- member countries.
C) a group of countries that trade freely with each other and have a common policy towards trade restrictions with non- member countries.
D) a group of countries that trade freely with one another, have a common policy concerning trade with non- member countries and a common tax and trade regulation system.