In agile environments with rapidly evolving knowledge, knowledge transfer should be continuous, lightweight, and embedded in the cadence of delivery. Mentoring the team and stakeholders to ensure domain knowledge is exchanged during sprints (B) supports sustainable knowledge flow through collaboration practices such as pairing, mob programming, frequent refinement sessions, shared demos, communities of practice, and lightweight documentation created "just in time." This avoids heavy upfront documentation that becomes obsolete quickly. Requiring complete documentation before starting (A) delays value and is unrealistic in a changing domain. Dedicating initial sprints primarily to knowledge transfer (C) can help onboarding in some cases, but it risks postponing delivery and losing stakeholder confidence; better is to combine learning with incremental delivery from the start. Relying on QA (D) is misaligned; QA focuses on product quality, not domain knowledge management. Embedded knowledge exchange improves resilience, reduces single points of failure, and enhances adaptability-key objectives for agile delivery and organizational learning.