2.Patrick bought a stock index fund today at $400 per unit. To protect this investment against loss, he also bought an at-the-money European put option on this fund for $20, with exercise price $400 and 3-month time to expiration. His wife, Marie, argues that Patricks purchase of that put option is unwise since another 3-month put with exercise price of $390 costs cheaper at $15. She suggests to buy this cheaper put instead.