2. A European put option on a stock with a strike price $49 expires in 3 months. The current stock price is $50, the risk-free interest rate is 6% per annum, and the volatility is 20% per annum. (a) Construct a three-period Cox-Ross-Rubinstein model with clear labels at each node and branch. (b) Use your model in (a) to find the current price of the option. (c) Use the Black-Scholes model to determine the current price of the option