Your network contains an Active Directory forest named adatum.com. The forest contains an Active
Directory Rights Management Services (AD RMS) cluster.
A partner company has an Active Directory forest named litwareinc.com. The partner company does
not have AD RMS deployed.
You need to ensure that users in litwareinc.com can consume rights-protected content from
adatum.com.
Which type of trust policy should you create?

A.
At federated trust

B.
A trusted user domain

C.
A trusted publishing domain

D.
Windows Live ID

Explanation:
In AD RMS rights can be assigned to users who have a federated trust with Active Directory
Federation Services (AD FS). This enables an organization to share access to rights-protected
content with another organization without having to establish a separate Active Directory trust or
Active Directory Rights Management Services (AD RMS) infrastructure. AD RMS and AD FS Considerations
http://technet.microsoft.com/en-us/library/dd772651(v=WS.10).aspx