WHICH OF THE FOLLOWING IS TRUE FOR COUNTRIES WITH FIXED EXCHANGE RATE REGIMES: Select one: O a. THE EXTERNAL VALUE OF THE COUNTRY'S CURRENCY WILL SIMPLY DEPRECIATE TO THE LEVEL AT WHICH THERE IS NO EXCESS SUPPLY OF THE COUNTRY'S CURRENCY O b. CENTRAL BANKS CANNOT USE MONETARY POLICY TO AFFECT THE ECONOMIC FUNDAMENTALS SUCH AS INFLATION C. THESE COUNTRIES MUST USE A CURRENCY BOARD. d. CENTRAL BANKS OF THESE COUNTRIES ARE REQUIRED TO MAINTAIN EXCHANGE RATE RESERVES TO COVER 100% OF THE EXISTING DOMESTIC CURRENCY