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

A. Configure each authentication server and ensure that the disks of each server form part of a duplex.
B. Configure each authentication server as belonging to a cluster of authentication servers.
C. Configure a single server as a primary authentication server and a second server as a secondary authentication server.
D. Configure each authentication server and ensure that each disk of its RAID is attached to the primary controller.