What role should be transferred to CorpDC4 as part of the operations master transfer?

The Domain Naming Master role should be transferred to CorpDC4 as part of the operations master transfer because this role is responsible for managing the addition and removal of domains in the forest. It ensures that domain names are unique within the forest and that no duplicate names exist. When a new domain is created, the Domain Naming Master verifies that the name chosen for the domain does not conflict with any existing domain names.

This role should ideally reside on a domain controller that is reliable and has good connectivity within the environment to effectively manage any changes in the domain structure. By transferring the Domain Naming Master Role to CorpDC4, it ensures that this critical function is supported and managed from a robust and appropriately positioned domain controller within the organization’s infrastructure.

In the context of the other roles, while all play important parts in the Active Directory environment, only the Domain Naming Master directly handles domain management responsibilities, making it the appropriate choice in this scenario.