Which system allows a country to print its currency and buy hard currencies or gold when it is running a trade surplus?

Question

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Under the fixed exchange rate system, a country fixes the value of its currency to a certain amount of another currency or a basket of currencies. This means that the country's central bank has to maintain the exchange rate by buying or selling currencies to keep it at the fixed rate. If a country is running a trade surplus, it will earn more foreign currency than it needs for importing goods, so it can use the surplus to buy other hard currencies or gold to strengthen its reserves. This system allows the country to control the exchange rate and build its foreign exchange reserves.

Which System Allows a Country to Print Its Currency and Buy