Synchronizing data and configurations between the two environments before the switch Synchronizing data and configurations between the blue and green environments is a critical step in a blue-green deployment. This ensures that when the switch is made from the blue to the green environment, the green environment is up-to-date with the latest data and settings, maintaining data consistency and preventing any loss of information or functionality. Option A is incorrect because while performance testing is important, it does not directly ensure data consistency be-tween the two environments. Option C is incorrect as load balancing between the two environments is not typically part of a blue-green deployment strategy, which focuses on one environment being active at a time. Option D is incorrect because simply increasing storage capacity in the green environment does not directly contribute to data consistency for the deployment.