Q16. The value of standard deviation for the rates of return of a stock is a. Squared variance of returns b. Squared mean of returns c. Usually higher than the variance d. The square root of the variance e. None of the above Q17. Which of the following factors increases the premium (price) of both a call option? a. Volatility b. The price of a put option c. The exercise price of a call option d. GDP e. None of the above