A bank is required to maintain an average daily balance at the Fed of $600 million. In the first 2 days of the maintenance period, it maintains a balance of $450 million, the next three days it maintains a balance of $700 million, the next two days it maintains a balance of $650 million, the next three days it maintains a balance of $450 million, and the next three days it maintains a balance of $650 million. What does its balance at the Fed has to be on the last day of the maintenance period in order to have a zero cumulative reserve deficit? A. $600 million B. $400 million C. $500 million D. $800 million E. None of the options is correct