Which company is responsible for the international transportation and delivery of GXG products?

The correct answer is based on the fact that FedEx Express is specifically recognized as the carrier for international transportation and delivery of Global Express Guaranteed (GXG) products. GXG is a premium service offered by USPS that provides guaranteed delivery to certain international destinations; however, the actual transportation is carried out by FedEx Express. This relationship allows USPS to leverage FedEx's global logistics network for timely and efficient delivery of these express international shipments.

FedEx Express ensures that GXG products are handled in a manner that meets the urgent delivery requirements and service commitments that customers expect from a guaranteed service like GXG. This collaboration between USPS and FedEx enables the seamless integration of USPS services with FedEx's international reach, enhancing the overall service quality for customers needing quick international delivery options.

In contrast, while USPS provides the GXG service, it does not directly manage the transportation itself for international deliveries; hence, other options like UPS and DHL do not apply in this context.