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 business partnership with 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.

All DNS zones are configured to only allow zone transfers to name servers for the zone.

Contoso and A.Datum 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 need to configure DNS1 to meet the following requirements:
.Allow Contoso users to resolve DNS names for adatum.com.
.Prevent the need for any modification on A.Datum DNS servers.
.Allow Contoso users to resolve DNS names internally and on the Internet.
Minimize administrative overhead.

What should you configure?

Exhibit:

A.
a conditional forwarder to DNS2

B.
a forwarder to ISPDNS

C.
a primary zone for the adatum.com domain

D.
a secondary zone for the adatum.com domain