The money manager at MSU Bank has estimated that the bank has a 20% chance of a liquidity deficit of $700 million, a 30% chance of a liquidity deficit of $200 million, a 30% chance of a liquidity surplus of $400 million and a 20% chance of a liquidity surplus of $900 million over the next week. What is the bank's expected liquidity deficit or surplus over the next week? O a. $400 illion liquidity surplus Ob. $500 million liquidity surplus O c. $100 million liquidity deficit O d. $100 million liquidity surplus