Which of the following pairs of portfolios have the same payoff? (A) a risk-free bond that promises $100 in three months(B) a short call and short with expiration date of three months and the underlying stock (A) a risk - free bond that promises $100 in three months (B) a short call and a long with expiration date of three months and the underlying stock (A) a risk-free bond that promises $ 100 in three months (B) a long call and a long with expiration date of three months and the underlying stock (A) a risk - free bond that promises $ 100 in three months a long call and short date of three months and the underlying stock Question 21 5pts Which of the following pairs of portfolios have the same payoff? O(A) a risk-free bond that promises $100 in three months; (B) a short call and short put both struck $100 with expiration date of three months and the underlying stock O(A) a risk-free bond that promises $100 in three months; (B) a short call and a long put both struck a $300 with expiration date of three months and the underlying stock O(A) a risk-free bond that promises $100 in three months; (B) a long call and a long put both struck a $500 with expiration date of three months and the underlying stock O(A) a risk-free bond that promises $100 in three months; (B) a long call and short put both struck at $100 with expiration date of three months and the underlying stock