Question 6 (2 points) Which of the following statements is/are correct about volatility? There is an arbitrage opportunity if the implied volatility is different from the realized volatility. The volatility smile refers to the relation between implied volatility of the options and the price of their underlying asset, given options with the same time to maturity and the same strike prices. The true volatility is not directly observable from the market data. When using the standard deviation of historical returns to estimate current volatility, the longer the historical sample period is, the more accurate the estimation becomes