The plot below illustrates the maturity payoff (not profit/loss) of an option trading strategy. The current stock price is $50. Only call options are used in the strategy.

a) Write down the payoff of the strategy as a function of stock price at option maturity.

b) Reverse engineer the strategy and figure out what call options are used in the strategy. What are the strike prices? How many of each option are used? Long or short?

c) Use a table to write down the payoffs of each option position and the overall strategy in b) above, as a function of stock price at option maturity. Is the overall payoff identical to the one in part a) above?