If the exchange rate between the Guyana (G$) and the American dollar (US$) changes from G$206.5/1$ to C$195/US$ but the Guyana government wants to maintain an exchange rate of C$206.5/1US$, what should the Bank of Guyana do? O a. Sell Guyana dollars (buy US dollars). O b. Sell US dollars (buy Guyana dollars) O Purchase British pounds and sell French Francs. O d. Stop trading with the US so that fewer US dollars will flow into Guyana