Consider a stock currently at price S0=$60. Assuming a binomial model, let the stock's price at time T=2 years be either Su=$65 (with probability 0.75 ) or Sd=$55 (with probability 0.25 ). A Call option with strike price $60 and exercise date T=2 costs $7. (a) Do you see an arbitrage opportunity here? Justify your answer. (b) If there is arbitrage, suggest a strategy to make risk-free profit. Justify your