4. Assume that you have 100 shares of XYZ stock which has a volatility of 30% and a current stock price of 60 per share. XYZ pays no dividends. The risk-free interest rate is 3%. 4.1 Use the Black-Scholes option pricing model to value a six-month, at-the- money European put option on XYZ stock with the information as specified above (10 %) 4.2 Given the information above, what action should you take to hedge using call options and put options, respectively? What would be the total value of these two transactions? (8 %) 4.3 Give and briefly discuss three main problems when using the Black- Scholes option pricing model (9 %) 4.4 Which of the following statements is incorrect? Explain briefly A. Three benefits of constructing global investment portfolios are more investment choices, often higher rates of retum, and low correlations between markets. B. An option's theoretical value depends on a synthetic risk-free portfolio Both put and call options magnify the possible positive and negative retums of investing in the underlying security C. In a collar agreement, like the forward contract hedge, there is no initial out-of-pocket expense associated with this derivative combination. Instead, the manager effectively pays for her desired portfolio insurance by surrendering an equivalent amount of the portfolio's future upside potential D. An option combination known as Strangle, which involves the simultaneous purchase or sale of a call and a put on the same underlying security with the same expiration date, offers a greater risk reward structure than the straddle