Your network contains an Active Directory forest named contoso.com. The forest contains
an Exchange Server 2010 Service Pack 1 (SP1) organization.
A partner company has an Exchange Server 2010 SP1 organization.
You need to implement federated delegation between your organization and the partner
organization.
What should you do first?

A.
Create a federation trust

B.
Install the Federation Service Proxy role service.

C.
Create a forest trust.

D.
Install the Federation Service role service.