单选题Which of the following offers the MOST redundancy for a system but is also very costly？ （）A RAID implementationB Disk-to-disk replicationC Server-to-server clusteringD Hot site replication
单选题
Which of the following offers the MOST redundancy for a system but is also very costly？ （）
A
RAID implementation
B
Disk-to-disk replication
C
Server-to-server clustering
D
Hot site replication
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