According to Harris market makers Other a b Offer liquidity to obtain better prices for trades they want to do O cBuy and sell misvalued instruments d Complete quick round-trip trades without assumin

All of the above options are correct. Market makers provide liquidity to the market by buying and selling securities at quoted prices, and they also engage in arbitrage by exploiting price discrepancies between different markets. They may also buy and sell misvalued instruments, and execute quick round-trip trades without assuming much inventory risk. By doing so, they help ensure efficient pricing and trading in financial markets.