Which of the following statements is false about arbitrage trades? Select one: O A. In equilibrium, arbitrage trades cannot exist. OB. A trade (or set of trades) with a positive cash flow today, but zero cash flow in the future, is an arbitrage trade. O C. A trade (or set of trades) with zero cash flow today, but a positive cash flow in the future, is an arbitrage trade. O D. A trade (or set of trades) with a possible positive return is not necessarily an arbitrage trade. E. A trade (or set of trades) with a certain (probability one) positive return is an arbitrage trade