A third-party logistics provider (3PL) is .

a. Unselected a service firm that handles all of the logistics requirements for other companies
b. Unselected a transportation service provider that handles shipments for other firms based on long-term agreements or contracts
c. Unselected a transportation service provider that handles shipments on a case-by-case basis, without the need for long-term agreements or contracts
d. Unselected an agent who serves as an intermediary between an organization shipping a product and the actual carrier, typically on international shipments