Jack is traveling to Southeast Asia, Mariko has planned a visit to the Amazon, and Joe has to travel to Seattle for an advertising campaign. In the given scenario, which of the following statements is true?

a. Jack should use credit cards, Mariko should use traveler's checks, and Joe should use cash.
b. Jack should use traveler's checks, Mariko should use credit cards, and Joe should use cash.
c. Jack should use cash, Mariko should use traveler's checks, and Joe should use credit cards.
d. Jack should use traveler's checks, Mariko should use cash, and Joe should use credit cards.

d