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單項選擇題

An operator just completed a repair to a disk subsystem that contains a disk heartbeat. Before returning the system back into production mode， there is a requirement to verify the disk heartbeat is functioning. 
How should the operator determine if the disk heartbeat network functioning？（）   

A. Use the clinfo command to monitor the disk heartbeat
B. Use the mail command to check for messages form HACMP
C. Use the dhbread command to verify the disk heartbeat link
D. Use the clstat command to verify the appropriate network connections are available

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