Suppose a financial manager buys call options on 50,000 barrels of oil with an exercise price of \($15\) per barrel. She simultaneously sells a put option on 50,000 barrels of oil with the same exercise price of \($15\) per barrel. Consider her gains and losses if oil prices are \($10,\) \($12,$15,\) \($18,\) and \($20.\) What do you notice about the payoff profile?