Which name should you specify?

A company named Fabrikam, Inc. is deploying an Office 365 tenant. You install Active Directory Federation Services (AD FS) on a server that runs Windows
Server 2012.
The company’s environment is described in the following table:You must obtain a certificate from a certification authority and install it on the federation servers.
You need to specify the subject name for the certificate.
Which name should you specify?

• A. fs.fabnkam.com
• B. server1.fabrikam.com
• C. fabrikam.com
• D. server2.fabrikam.com

Answer: Option A.

Explanation: 

The Subject Name for the certificate must match the names used for AD FS. The cluster DNS name must match the Federation Service name. As the cluster DNS name is fs.fabnkam.com, we are using it for AD FS, and we must use it in the subject name for the certificate.
References:
http://blogs.technet.com/b/askds/archive/2012/01/05/understanding-the-ad-fs-2-0-proxy.aspx

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