Exam OG0-093 topic 1 question 190 discussion

In Phase A, the architecture team defines a high-level, abstract description of the baseline and target architecture, covering the business, data, application, and technology domains. These abstract definitions are then progressively refined and expanded throughout the subsequent phases of the ADM cycle. So the correct answer to your question would be: A. Phase A

Building Block Specification Process in the ADM In Phase A the earliest building block definitions start as relatively abstract entities within the Architecture Vision. https://pubs.opengroup.org/architecture/togaf8-doc/arch/chap32.html

Correct Answer Reference : https://pubs.opengroup.org/architecture/togaf9-doc/arch/index.html 33.3.2 Building Block Specification Process in the ADM The process of building block definition takes place gradually as the ADM is followed, mainly in Phases A, B, C, and D. It is an iterative process because as definition proceeds, detailed information about the functionality required, the constraints imposed on the architecture, and the availability of products may affect the choice and the content of building blocks.

In Phase A the earliest building block definitions start as relatively abstract entities within the Architecture Vision. https://pubs.opengroup.org/architecture/togaf8-doc/arch/chap32.html