Draw a payoff diagram for the following portfolios:
a. Buy a bond with a face value of $80, buy a call, with X = $80, and sell a put, with X = $80.
b. Buy a share of stock, buy a put, with X = $80, and sell a call, with X = $80.
c. Buy a share of stock, buy a put, with X = $80, and sell a bond with a face value of $80.