Final answer:
In Windows Server acting as a Domain Controller, you can change a Global group to a Universal group, and a Universal group to a Domain local group. Direct conversion of Global group to a Local group or Domain local to Global are not allowed.
Step-by-step explanation:
Within Windows Server acting as Domain Controller, certain changes in group scope are permissible provided that group nesting isn't configured between domains. Specifically, you can perform the following conversions:
- Global to Universal: A Global group can be changed to a Universal group if it does not contain other Global groups from other domains.
- Universal to Domain Local: A Universal group can be converted to a Domain local group assuming it is not nested within another Universal group from another domain.
Regarding the other options, a Global group cannot be directly converted to a Local group, and a Domain local group cannot be directly converted to a Global group because these transformations do not adhere to the scope and nesting rules operational within a Windows Server environment.