You work as an administrator at ABC.com. ABC.com has an Active Directory domain named ABC.com. All servers on the ABC.com network have Windows Server 2008 R2 installed and all workstations have Windows 7 installed.

You have configured a child domain, named us.ABC.com, which has two domain controllers named ABC-DC05 and ABC-DC06. ABC-DC05 and ABC-DC06 are configured as DNS servers.

You then create a DNS delegation.

Which of the following describes a reason for doing this?

A.
It makes sure that users in the ABC.com domain are able to access servers in the us.ABC.com child domain via their User Principal Name (UPN).

B.
It makes sure that users in the ABC.com domain are able to access servers in the us.ABC.com child domain via their fully qualified domain names (FQDNs).

C.
It makes sure that users in the ABC.com domain are prevented from accessing servers in the us.ABC.com child domain via their User Principal Name (UPN).

D.
It makes sure that users in the ABC.com domain are prevented from accessing servers in the us.ABC.com child domain via their fully qualified domain names (FQDNs).