Which of the following is a category of international mail that provides expedited service?

The category of international mail that provides expedited service is known as GXG, which stands for Global Express Guaranteed. This service is designed to provide fast shipping across international borders, with guaranteed delivery times typically within one to three business days depending on the destination. GXG includes tracking and may offer international money-back guarantees, making it a reliable option for customers needing urgent shipments.

This service is distinctly structured to cater to customers looking for the quickest possible delivery while ensuring that their packages can be monitored throughout transit. The option is utilized for various types of items, such as documents and parcels, making it versatile for international shipping needs.

The other categories mentioned, while relevant to international mail services, do not specifically highlight expedited service in the same way as GXG.