Your network contains two Active Directory domains named contoso.com and adatum.com. The network contains a server named

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Your network contains two Active Directory domains named contoso.com and adatum.com.
The network contains a server named Server1 that runs Windows Server 2012 R2. Server1 has the DNS Server server role installed. Server1 has a copy of the contoso.com DNS zone.
You need to configure Server1 to resolve names in the adatum.com domain. The solution must meet the following requirements:
Prevent the need to change the configuration of the current name servers that host zones for adatum.com. Minimize administrative effort.
Which type of zone should you create?

A. Secondary
B. Stub
C. Reverse lookup
D. Primary