A key feature of the application silo stage of the enterprise IT architecture is:

The application silo stage of enterprise IT architecture is characterized by the development and use of IT applications that cater specifically to individual users' needs. In this stage, applications are often created and maintained in isolation, leading to a fragmented environment where different departments or user groups utilize different systems tailored to their particular requirements. This focus on specific user needs enables a high degree of customization and flexibility for those within each silo but often results in challenges regarding integration, data sharing, and collaboration across the organization.

In contrast to this choice, standardized infrastructure and business processes usually represent later stages in the IT architecture, where the goal is to unify systems and streamline operations across the enterprise. While experiments to meet local needs may occur, they do not encapsulate the primary feature of silos, which revolves around customization for distinct user groups rather than experimentation or a standard infrastructure. Thus, the emphasis on IT applications designed for specific user requirements aptly encapsulates the essence of the application silo stage.