Final answer:
The three domain-specific FSMO roles are RID master, PDC emulator, and Infrastructure master, which correspond to answer A.
Step-by-step explanation:
The three Flexible Single Master Operations (FSMO) "domain-specific" roles assigned to the first domain controller installed in an Active Directory domain are:
- RID master
- PDC emulator
- Infrastructure master
Therefore, the correct answer is A. RID master, PDC emulator, Infrastructure master.
The RID master is responsible for processing RID pool requests from all domain controllers within a given domain. The PDC emulator acts as a backup for legacy systems that utilize the older NT 4.0 domain model and also responds to authentication requests. Lastly, the Infrastructure master is in charge of updating references from objects in its own domain to objects in other domains.