Which two requirements must an administrator consider prior to implementing SmartIO? (Choose two.)

Which two requirements must an administrator consider prior to implementing SmartIO? (Choose two.)
A . The device must have CDS disk format.
B . Veritas file system (VxFS) disk layout must be version 9.
C . Three nodes are required for VxFS writeback caching.
D . Veritas Volume Manager (VxVM) disk group must be version 180.
E . Cache must be local to each node.

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Answer: C,E