Which of the following statements is true?
A. The special drawing right (SDR) is a basket of currencies made up of U.dollars, euros, British pounds, and Japanese yen.
B. Today, only China and Switzerland have currencies fixed to gold.
Currencies whose prices are fixed to the same commodity would ensure that arbitrage will not work and exchange rates will be floating.
D. A country maintains a floating exchange rate value to weaken the international value of its currency.