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