9. Consider: electricity, natural gas and oil. a) which of these energy sources' prices would be the most volatile and have the highest level of mean-reversion? Why? b) choose one of the three and briefly explain how energy producer can use derivatives to hedge risks. 10. European-style floating lookback call option on a stock index has a maturity of six months. The current level of the index is 600, the risk-free rate is 4% per annum, the dividend yield on the index is 2% per annum, and the volatility of the index is 30%. Find the value of this option