The described phase involves defining a set of domain architectures approved by stakeholders to address a problem, identifying gaps, and working to clear those gaps. This aligns with phases B (Business Architecture), C (Information Systems Architectures), and D (Technology Architecture) of the TOGAF ADM (Architecture Development Method). These phases collectively involve developing architectures that meet stakeholder requirements and working to close any identified gaps in order to realize the desired changes. Therefore, the correct answer is Phase B, C, and D.