Which of the following is necessary for tailing a hedge? O a. Comparing the size in units of the position being hedged with the size in units of the futures contract O b. Comparing the futures price of the asset being hedged to its forward price Oc. Comparing the value of the position being hedged with the value of one futures contract O d. All the answers are incorrect Which best describes a horizontal option spread? O a. long June call struck at 100 and simultaneously short June call struck at 120 O b. long June call struck at 100 and simultaneously long June put struck at 80 OC. short June call struck at 100 and simultaneously long July call struck at 100 O d. short June call struck at 100 and simultaneously short July put struck at 100