The objectives for the ADM (Architecture Development Method) phases relate to specific tasks within those phases. Reviewing the objectives provided: Finalizing the Architecture Roadmap and the supporting Implementation and Migration Plan is a key activity of phase F (Migration Planning), ensuring that the business value and cost of work packages and Transition Architectures is understood by key stakeholders aligns with phase F as well, defining the overall Solution Building Blocks (SBBs) to finalize the Target Architecture based on the ABBs (Architecture Building Blocks) is an activity of phase E (Opportunities and Solutions), and ensuring conformance with the Target Architecture by implementation projects is part of phase G (Implementation Governance). Therefore, the correct mapping is option A: 1F-2F-3E-4G.