On May 8, 2013, an investor owns 100 Google shares. The share price was about $870 and a December put option with a strike price $820 costs $30.50. The investor is comparing two alternatives to limit downside risk. The first involves buying one December put option contract with a strike price of $820. The second involves instructing a broker to sell the 100 shares as soon as Googles price reaches $820. Discuss the advantages and disadvantages of the two strategies.