What should you tell her?

Domain.com has hired you as a systems administrator for their network. The Domain.com network consists of a single Active Directory domain named Domain.com. All servers on the Domain.com network run Windows Server 2008 and all client computers run Windows Vista.
A Domain.com user named Kara Lang is a junior technician in your department. Kara Lang wants to know which server forms part of the Active Directory topology as well as the schema information repository for the Active Directory.
What should you tell her?

A.
You should tell her the Global Catalog.

B.
You should tell her the Domain Controller.

C.
You should tell her the Domain Partition.

D.
You should tell her the Schema Master.

Explanation:
The Global Catalog holds information regarding multiple domains. Having more Global Catalog servers added is capable of greatly increasing the performance of operations such as shared
folder and printer searches. The other options are features of Active Directory, yet they have not been designed for fast searching across numerous domains.