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Question :-

You are planning the Active Directory Federation Services (AD FS) architecture for a hybrid deployment of Office 365 to 2,000 users. You plan to configure single sign-on for all users. You need to minimize the number of dedicated federation servers and dedicated federation proxy servers for the deployment. How many servers should you use?
One dedicated federation server and one dedicated proxy server
Two dedicated federation servers and four dedicated proxy servers
Two dedicated federation servers and two dedicated proxy servers
Four dedicated federation servers and four dedicated proxy servers

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