References:

The chart illustrates that, in practical enterprise architecture work, ADM phases do not always have to be executed as a simple waterfall sequence. The TOGAF ADM is iterative: iteration may occur over the whole ADM cycle, between phases, and within phases. TOGAF also states that the ADM is a generic method and may be tailored to the needs of the enterprise. This means that, depending on the purpose of the architecture work, phases and activities may overlap or be performed in parallel where this is appropriate.
In the chart, Phase B, Phase C, Phase D, and Phase E activities are shown overlapping. This represents a practical approach where Business Architecture, Information Systems Architecture, Technology Architecture, and Opportunities & Solutions work may be developed together to produce and test a candidate architecture and roadmap. This aligns with the TOGAF practitioner guidance that architecture work must support business decision cycles and that candidate architecture and candidate roadmap material should be ready before key planning and budget decisions.
Option A is incorrect because TOGAF does not mandate the use of Gantt charts. A Gantt chart may be a useful communication or planning tool, but the concept being illustrated is not that Enterprise Architects
"must" use Gantt charts. TOGAF emphasizes communication with stakeholders and decision-makers, but it does not prescribe Gantt charts as mandatory.
Option C is incorrect because TOGAF does not require the ADM phases to be executed strictly sequentially in every situation. TOGAF explicitly identifies the ADM as iterative and adaptable. It also states that the order of ADM phases may depend on architecture maturity, enterprise principles, business principles, and the specific needs of the enterprise.
Option D is incorrect because the durations shown in the chart are illustrative only. TOGAF does not define fixed durations for developing Enterprise Architecture phases. For each ADM iteration, decisions must be made about the breadth of coverage, level of detail, time period, and architecture assets to be leveraged. These decisions depend on the enterprise context, resources, competence, and expected value.
Therefore, the best answer is B , because the chart illustrates overlapping ADM phase execution in practice, leading toward development, review, and acceptance of a candidate architecture and roadmap.
References: TOGAF Standard, Version 9.2, Part II: Architecture Development Method, Chapter 4, Sections 4.2 and 4.3. The Open Group, World-Class EA: A Practitioners' Approach to Developing Enterprise Architecture Following the TOGAF ADM , guidance on business cycle alignment, candidate architecture, candidate roadmap, and practitioner timing.