Which of the following structures has a different configuration from the other three? 
Definitions:
USPS
The United States Postal Service, a federal agency responsible for providing postal delivery in the United States.
Single Platform
A unified system or service that offers various functions or capabilities within a single solution, simplifying user interaction and integration.
Low-end CRM
Customer Relationship Management systems designed to meet the basic needs of an organization with simpler, more cost-effective solutions.
Winning Back
Refers to strategies or efforts aimed at regaining the favor, business, or support of former customers, clients, or partners.
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