7. The market price for Facebook, Inc. (ticker: FB) today was $172.56 at the time when Mark bought a put option today. The put premium is $4.40 and the exercise price is $160. The option will be expired on May 18, 2018. (Total 18 points) a. Mark is the buyer of the put option. Explain to someone who has no idea about Mark's put option. In other words, give a complete definition of a put option from the buyer's point of view using the actual data stated in this problem including premium, exercise price, expiration date, and so on. (4 points) b. Draw a contingency graph for Mark. Label each point on the graph. What is the break-even point for Mark? (8 points) c. Show the profitloss if, at the expiration date, the FB price is (1) 100, (2) S158, (3) S173. (Total 6 points)