Schema Master
Domain Naming Master
PDC Emulator
RID Master
Answer:
PDC Emulator
| ROLE NAME | SCOPE | DESCRIPTION |
| Schema Master | 1 per forest | Controls and handles updates/modifications to the Active Directory schema. |
| Domain Naming Master | 1 per forest | Controls the addition and removal of domains from the forest if present in root domain. |
| PDC Emulator | 1 per domain | PDC is short for Primary Domain Controller, which was the main domain controller used with Windows NT. The PDC emulator provides backwards compatibility for NT4 clients. It also acts as the primary server for password changes and as the master time server within the domain. |
| RID Master | 1 per domain | Allocates pools of unique identifiers to domain controllers for use when creating objects. |
| Infrastructure Master | 1 per domain | Synchronizes cross-domain group membership changes. The infrastructure master cannot run on a global catalog server unless all DCs are also GCs. |
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