13. Check the following combinations of puts and calls and determine whether they conform to the put-call parity rule for European options. If you see any violations, suggest a strategy. a. July 155 b. August 160 c. October 170 14. Repeat problem 13 using American put-call parity, but do not suggest a strategy. 13. Check the following combinations of puts and calls and determine whether they conform to the put-call parity rule for European options. If you see any violations, suggest a strategy. a. July 155 b. August 160 c. October 170 14. Repeat problem 13 using American put-call parity, but do not suggest a strategy