Which of the following statements about TOGAF Building Blocks is true?

Building Blocks can and often should be composed of other Building Blocks to manage complexity and promote reusability in a hierarchical manner.

Architecture Building Blocks are identified and refined throughout various phases of the ADM, starting from early conceptualization, not solely first selected in Phase D.

TOGAF specifies that Building Block specifications should be loosely coupled to implementation details, meaning they define required functionality and interfaces without dictating precise technological choices. This enables greater flexibility, allowing different solution implementations to conform to the same architecture Building Block specification.

Custom developments are generally considered Solution Building Blocks (SBBs) as they are specific implementations, whereas Architecture Building Blocks (ABBs) are logical components describing required capabilities.