My bank has a larger number of adjustable-rate mortgage loans outstanding. To protect our interest rate income on these loans the bank could
I. enter into a swap to pay fixed and receive variable.
II. enter into a swap to pay variable and receive fixed.
III. buy an interest rate floor.
IV. buy an interest rate cap.
A. I and III only
B. I and IV only
C. II and III only
D. II and IV only