Which of the following BEST minimizes performance degradation of servers used to authenticate users of an e-commerce website?

Which of the following BEST minimizes performance degradation of servers used to authenticate users of an e-commerce website?
A . Configure a single server as a primary authentication server and a second server as a secondary authentication server.
B. Configure each authentication server as belonging to a cluster of authentication servers.
C. Configure each authentication server and ensure that each disk of its RAID is attached to the primary controller.
D. Configure each authentication server and ensure that the disks of each server form part of a duplex.

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Answer: B