What is the delivery speed for Global Express Guaranteed?

The delivery speed for Global Express Guaranteed is accurately characterized by the option representing a timeframe of 1-3 business days. This service is designed for customers who require expedited international shipping with a guaranteed delivery timeframe, making it one of the fastest options offered by USPS for international shipments.

Global Express Guaranteed includes features such as tracking and insurance, adding further value for senders needing quick and reliable delivery services. The specified timeframe ensures that customers can plan accordingly for urgent documents or packages, reinforcing the service's reliability and efficiency in meeting urgent delivery needs.

While the other options suggest longer delivery speeds—3-5 business days, 5-7 business days, and next day delivery—the specifics of Global Express Guaranteed's commitment to delivering within the 1-3 business day window sets it apart, making it the correct choice for this question.