Your network contains an Active Directory forest.
The forest contains two domains named contoso.com and fabrikam.com.
The functional level of the forest is Windows Server 2003.
You have a domain outside the forest named adatum.com.
You need to configure an access solution to meet the following requirements:
– Users in adatum.com must be able to access resources in contoso.com.
– Users in adatum.com must be prevented from accessing resources in fabrikam.com.
– Users in both contoso.com and fabrikam.com must be prevented from accessing resources in adatum.com.
What should you create?

A.
A one-way external trust from contoso.com to adatum.com
B.
A one-way realm trust from adatum.com to contoso.com
C.
A one-way realm trust from contoso.com to adatum.com
D.
A one-way external trust from adatum.com to contoso.com
Why external trust?
It is not said that adatum.com is an Active Directory domain. It is said it is a domain outside the forest. It may be anything else.
I would think the answer is C.
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It’s an external trust because the functional level of the forest is Windows Server 2003. To be an External Trust the Functional level has to be below 2008.
A should be the correct answer here.
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