In ITIL 4, the deployment model development and improvement process involves creating or refining models to enhance deployment effectiveness. Implementing a newly updated deployment model typically requires formal authorization and coordination, which is achieved through a change request (Option B). A change request initiates the process to assess, approve, and execute the model update in a controlled manner, ensuring alignment with organizational governance and other practices like change enablement.
Option A (Lessons learned): Incorrect, as lessons learned are an output for improving future processes, not a trigger for implementing a new model.
Option B (Change request): Correct, as a change request is the formal mechanism to propose and implement a new or updated deployment model, per ITIL 4's integration with change enablement.
Option C (Updated knowledge management articles): Incorrect, as knowledge articles support documentation and training but do not trigger implementation.
Option D (Deployment review reports): Incorrect, as review reports provide insights or feedback, not the authorization needed to implement a model.