What IS TRUE regarding payment for order flow? a. The real cost of a stock trade may not be the same as the commissions or fees advertised to trade b. Your broker is paying the exchanges to ensure you get the best price when trades are executed c. These payments are an insignificant part of trading income for many firms who receive it d. You can't pay both a brokerage commission and a dealer's bid/ask spread on the same trade, so it's a non-issue