The best approaches for UC to consider are B and C, as they both involve agile methodologies that can accommodate changing requirements and deliver value to the end users in an iterative and collaborative way. Option B is a good approach, as it allows UC to scope and estimate the project, identify the minimum viable product, and co-create the design with the project stakeholders using a product backlog and sprints2. Option C is also a good approach, as it allows UC to gather the remaining requirements and complete the architecture and design, then initiate the build/test processes with frequent reviews by the stakeholders, and perform acceptance testing and validate compliance with regulatory requirements3. Option A is not a good approach, as it involves a waterfall project that is rigid and sequential, and may result in re-work and delays if the requirements change or conflict4. Option D is not a realistic approach, as it assumes that budget and timeline will not be a factor with an agile methodology, which is not true, as agile projects still need to have clear scope, budget, and timeline constraints