D$1$ and S$1$ represent the initial demand and supply curves. If the supply of British pounds in the foreign exchange market shifts to S$3,$ and the British government wants to fix the exchange rate at its initial level, then it should $\_\_\_\_\_.$

Question $63$ options:

sell U$.$S$.$ dollars out of its reserves

buy U$.$S$.$ dollars to add to its reserves

sell British pounds in the foreign exchange market

buy British bonds in the open market