Which of the following is true about fixed exchange rate system? 1. Central bank is not needed, because currency values do not change 2. Currency values are allowed to change within a narrow range 3. Exchange rate risk is minimal to companies 4. Central bank intervention in currency markets is frequent 1. I, II, and Ill only 2. I, III, and IV only 3. II, III, and IV only 4. I, II, and IV only only