The retailer in the last question offers its customers guarantees:" if you're not completely happy that we meet your standards, we'll give you your money back!" There are no additional terms to the guarantees. Which of the following is true?

a. If a customer isn't happy, they don't have to pay, even for a custom order.

b. If a customer isn't happy for a reasonable issue, they don't have to pay, even for a custom order.

c. If a customer isn't happy, they don't have to pay, unless it's a custom order.

d. If a customer isn't happy in a situation where there's an objective reason to be unhappy they don't have to pay