Which one of the following is NOT a required component for running an OCFS2 filesystem resource in a Pacemaker cluster?

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Which one of the following is NOT a required component for running an OCFS2 filesystem resource in a Pacemaker cluster?
A . A clone resource for the OCFS2 file system.
B . A shared storage device accessible by all nodes using the OCFS2 filesystem.
C . The distributed lock manager (DLM).
D . The cluster logical volume manager (CLVM).
E . The O2CB service.

Answer: D