On the 4th of June 2016, the Central Bank of Terrania sells 100 million Terranian Kwacha worth of foreign exchange in order to support the currency. Over the same week the Central Bank earned 10 million Kwacha a day of earnings on it assets. If the Central Bank's aim is to keep the monetary base unchanged every day, which of the following is an appropriate open market operation? Select one: O a. to buy 90 million kwacha of money market instruments on june 6th b. to sell 90 million kwacha of money market instruments on june 6th c. to sell 110 million kwacha of money market instruments on june 4th O d. to sell 90 million kwacha of money market instruments on june 4th O O e. to buy 110 million kwacha of money market instruments on june 4th Of. to sell 100 million kwacha of money market instruments on june 6th g. to buy 90 million kwacha of money market instruments on june 4th Oh. to buy 110 million kwacha of money market instruments on june 6th