4. In a country with a fixed exchange rate system, the central bank purchased large quantities of foreign currency to prevent its domestic currency from appreciating. The following will be the result on the country's Balance of Payments (BOP): a. The official reserve account will be in deficit and the country's BOP will also be in deficit. b. The official reserve account will be in surplus and the country's BOP will also be in surplus. c. The official reserve account will be in deficit and the country's BOP will be in surplus. d. The official reserve account will be in surplus and the country's BOP will be in deficit