"Consider the following 4 options on AAPL: (a) 1-year 25-delta call, (b) 1-year 25-delta put, (c) 2-year 50-delta call, (d) 2-year 60-delta put. Which of the 4 options has its strike price closest to the strike of a 1-year 75-delta put option on AAPL?" a b O O O O