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單項選擇題

A two-node cluster has both a single TCP/IP heartbeat and a single non-IP serial heartbeat. TheService Level Agreement regarding the speed of cluster fallover has been updated，and Fast Disk Takeover will be implemented to meet the new Service Level Agreement. 
Which of the following should be implemented to increase the reliability of Fast Disk Takeover？（）  

A. Disk should be mirrored across separate storage enclosures.
B. Disk heartbeats should be added over multiple disk adapters.
C. Disk major and minor numbers should be set as unique across nodes.
D. Disk adapter queue_depth should be increased from the default values.

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