Under what circumstances might an investor want to buy both call options and put options on a stock at the same time? OA. If the investor expects a large change in a stock price but is uncertain which direction it will be. OB. If the investor expects volatility in the market to decrease causing stock prices to stabilize. OC. If the investor is very confident that a stock's price will increase significantly in the near future. OD. If the investor is very confident that a stock's price will decrease significantly in the near future.