You have an Exchange Server 2010 Edge Transport server named Server1.
A partner organization has an Exchange Server 2010 Edge Transport server named Server2.
You need to encrypt SMTP communication between Server1 and Server2. The solution must ensure that both servers use a trusted certificate.
What should you do?
A. Enable Domain Security authentication.
B. Enable Exchange Server authentication.
C. Enable Externally Secured authentication.
D. Disable the Anonymous users permission group.
