Regarding foreign exchange, analyze the following statements:

I- The exchange rate is the equivalence between two currencies, that is, the number of national coins needed to acquire a unit of foreign currency.

II- The exchange rate is only necessary for the exchange of products between countries.

III- The fixed exchange rate regime is determined by the State through its monetary authority.

IV- The flexible exchange rate regime is determined by the free market forces.

V- The tariff is the tax applied to foreign goods entering a national market.