Suppose you are attempting to value a 1-year expiration option on a stock with volatility (i.e., annualized standard deviation) of o = 0.49. a. I period of 1 year. b. 4 subperiods, each 3 months. c. 12 subperiods, each 1 month. What would be the appropriate values for u and d if your binomial model is set up using: (Do not round intermediate calculations. Round your answers to 4 decimal places.) Subperiods u = explov At) d = exp(-ov At) At = T/ n 1/1 = 1 1/4 = 0.25 1/12 = 0.0833 b. 4