A vSphere administrator configures a preferred heartbeat datastore in an HA/DRS cluster configuration. The vCenter Server identifies an alternative preferred datastore. Why would vCenter Server identify an alternative preferred datastore over the administrator's preference?
A. The selected datastore contains powered-on virtual machines.
B. The selected datastore is formatted with a 1 MB block size.
C. The selected datastore is an NFS datastore.
D. The selected datastore is not accessible to all of the hosts.
Answer: D
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