Which of the following statements is incorrect regarding single stock futures? a. Single stock futures are available only on stocks of companies that are in the S&P 500 index. b. Investors who expect a particular stock's price to decline over time can sell futures contracts on that stock, or they can sell the stock short. C. Single stock futures are traded in the United States at OneChicago d. Single stock futures are regulated by the Commodity Futures Trading Commission (CFTC) and the Securities and Exchange Commission. e. All of these choices are correct