You are designing an Exchange organization for a company named Contoso, Ltd. All servers in the organization will have Exchange Server 2010 Service Pack 1 (SP1) installed. Contoso has a partner company named Fabrikam, Inc. Fabrikam has an Exchange organization that contains only Exchange Server 2010 SP1 servers. You plan to configure a federation trust between Fabrikam and Contoso.
You need to recommend a certificate for the federation trust.
Which of the following certificates is the best recommendation? (More than one answer choice may achieve the goal. Select the BEST answer.)
A.
a certificate from a third-party certification authority (CA)
B.
a certificate from an internal certification authority (CA)
C.
the self-signed certificate automatically generated by the Exchange 2010 Setup wizard
D.
the self-signed certificate automatically generated by the New Federation Trust wizard