Consider IKEA's return policy:

"If you've changed your mind and are not entirely satisfied with your purchase, simply return the unused item within

45 days for an exchange or refund."

IKEA's return policy represents:

a) a European put option written by IKEA.

b) a European call option written by IKEA.

c) an American put option written by IKEA.

d) an American call option written by IKEA.

e) a European put option written by IKEA customers.

f) an American put option written by IKEA customers.