You are the network administrator for Contoso, Ltd.The network consists of an Active Directory forest that contains one domain named contoso.com.All servers run Windows Server 2003 Service Pack 2 (SP2).

Contoso has a subsidiary named A.Datum Corporation.The A.Datum network consists of an Active Directory forest that contains one domain named adatum.com.All A.Datum servers run Windows Server 2003 SP2.

Contoso and A.Datum offices are connected by a dedicated WAN link.The relevant portion of the network is configured as shown in the exhibit.

Datum servers are inaccessible from the Internet.

You must configure DNS1 to meet the following requirements:

.Allow Contoso users to resolve DNS names for adatum.com.

.Minimize DNS lookup traffic over the WAN link.

What should you configure on DNS1?

Exhibit:

A.
a delegation record for adatum.com

B.
a secondary zone for adatum.com

C.
a stub zone for adatum.com

D.
DNS2 as a conditional forwarder for adatum.com