Which of the Following Statements Is FALSE

Which of the following statements is FALSE?

A) On Nasdaq, shares can and do have multiple market makers who compete with each other. Each market maker must post bid and ask prices in the Nasdaq network where they can be viewed by all participants.
B) Bid prices exceed ask prices.
C) Because customers always buy at the ask and sell at the bid, the bid-ask spread is a transaction cost investors have to pay in order to trade.
D) On the floor of the NYSE, market makers (known on the NYSE as specialists) match buyers and sellers.