Which type of Building Block is defined in terms of business capability and function?

The Architecture Building Block (ABB) is defined in terms of business capability and function, making it the correct choice in this question. ABBs represent the essential components of the architecture that are aligned with the business's overall objectives and capabilities. They capture various aspects, including the structure, behavior, and operations of the organization, which facilitate understanding the relationships and dependencies within the architecture.

By focusing on business capabilities, ABBs help articulate how the architecture supports business functions and strategic goals. They provide a clear view of the necessary resources and services needed to achieve objectives, aligning IT strategy with business priorities.

The other options are relevant but do not specifically encapsulate the definition provided in the question. Solution Building Blocks (SBB) are more technical in nature, focusing on specific solutions or implementations rather than broader business capabilities. Business architecture refers to a discipline or domain within architecture but is not specifically termed as a building block in the same context. Data architecture focuses on data management and storage aspects rather than business functions or capabilities, which is a more specific domain.