The Federal Reserve purchases US$ 15 billion in US Treasury Securities on the same day that the US Treasury Department deposits US$13 billion from tax collections. What is the implied net impact to Currency in Circulation assuming no other transactions? O a. Currency in Circulation INCREASES by SUS 28 billion O b. Currency in Circulation INCREASES by $US 2 billion Oc Currency in Circulation DECREASES by SUS 2 billion O d. Currency in Circulation DECREASES by $US 28 billion e. Not enough information is provided to determine a change in Currency in Circulation