问题：

[单选]

You have an Exchange Server 2010 organization. 
Your company acquires another company that has an Exchange Server 2010 organization. 
You need to recommend a solution for the Exchange Server 2010 organization to meet the followingrequirements： 
.All users must be able to view the global address lists （GALs） for both organizations.All users must be able to view free/busy information for users in both organizations 
What should you include in the solution？（）

A . .Implement Active Directory Federation Services （AD FS） .Run the Microsoft Exchange Inter-Organization Replication tool
B . .Implement Microsoft Identity Lifecycle Manager （ILM） 2007 .Create a two-way cross-forest trust between both organizations
C . .Create a federation trust between both organizations .Implement Microsoft Identity Lifecycle Manager （ILM） 2007 .Run the New Organization Relationship wizard
D . .Create a two-way cross-forest trust between both organizations .Implement Active Directory Federation Services （AD FS）.Run the Microsoft Exchange Inter-Organization Replication tool