Option C seems correct because it is important to document all the customizations added to the system, such as code, configuration, integrations, etc., so that they can be easily understood, maintained, and updated by the support team or future developers.

Option D seems correct because it is essential to communicate and train users on new features that are rolled out to support UC’s business needs and goals. This can help usersadopt the new features faster and more effectively, as well as reduce confusion or frustration.

Option E seems correct because it is advisable to have separate environments for development, training, and production purposes. This can help ensure that new features are developed and tested in a safe and isolated environment before being deployed to the production environment where they can affect real users and data.