Question 4(20pts). A trader buys (long) a call option with a strike price of $120 and sells (short) a put option with a strike price of $100. Both options have the same maturity. The call costs $20 and the price of put is $10. What is the portfolio payoff at expiry if the security price at expiry is $70 ? Draw a diagram showing the variation of the trader's profit with the security price at expiry