6.11. Consider Portfolio A: long 1 American put on a stock with strike price K and expiration at T; short 1 American call on the same stock with the same strike and expiration date; and long 1 share of stock. 6.11. Consider Portfolio A: long 1 American put on a stock with strike price K and expiration at T; short 1 American call on the same stock with the same strike and expiration date; and long 1 share of stock