Assume the price Stof ZM at time t satisfies the log- normal model with volatility 16% and expected rate of return 10%. The spot price is $40. The risk-free rate is 5%. Portfolio Y has the following payoff in 2 years: the payoff is $50 if the price of IBM in 2 years is less than $30 and, the payoff is $25 if the price of IBM is 2 years is more than $30. Compute today's price of Portfolio Y. Select one: a. between 24 and 25 b. between 25 and 26 c. between 23 and 24 d. between 22 and 23 Assume the price Stof ZM at time t satisfies the log- normal model with volatility 16% and expected rate of return 10%. The spot price is $40. The risk-free rate is 5%. Portfolio Y has the following payoff in 2 years: the payoff is $50 if the price of IBM in 2 years is less than $30 and, the payoff is $25 if the price of IBM is 2 years is more than $30. Compute today's price of Portfolio Y. Select one: a. between 24 and 25 b. between 25 and 26 c. between 23 and 24 d. between 22 and 23