Your network contains two Active Directory forests named contoso.com and litwareinc.com.
A two- way forest trusts exists between the forest. Selective authentication is enabled on the trust.
The contoso.com forest contains a server named Server1.
You need to ensure that users in litwareinc.com can access resources on Server1.
What should you do?

A.
Install Active Directory Rights Management Services on a domain controller in contoso.com.

B.
Modify the permission on the Server1 computer account.

C.
Install Active Directory Rights Management Services on a domain controller in litwareinc.com.

D.
Configure SID filtering on the trust.

Explanation:
http://technet.microsoft.com/en-us/library/cc772808(v=ws.10).aspx