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The main purpose of the e-commerce architecture tier that runs the software is focused on executing business processes effectively. This tier is responsible for managing backend functions, which include user transactions, order processing, inventory management, and capturing business logic. It ensures that the rules and processes defined by the business model are implemented correctly, facilitating a smooth interaction between the front-end interface that users see and the database where data is stored.

While other options touch on essential aspects of an e-commerce system, they don't encapsulate the core functionality of the tier that operates the software. Data processing, for instance, relates to managing and analyzing data but does not emphasize the broader scope of business operations. User experience management focuses more on the design and interaction with users rather than the underlying processes that drive the e-commerce platform. Visual content delivery pertains primarily to how images and videos are served to users, which is a crucial aspect of design but separate from the software's operational core. Thus, the emphasis on business process modeling reflects the purpose of coordinating and supporting all transactional activities crucial for an e-commerce system.