You want to configure RDF so that either system can become the RDF primary system after a
planned switchover. Which statement must be true?

A.
The primary and backup systems must be configured with the same number of processors.

B.
The disk cache settings must be identically configured on the primary and backup systems.

C.
Each RDF-protected disk volume on the primary system must map to exactly one RDF update
volume on the backup system.

D.
Each RDF-protected disk volume must have the same device name on the primary and
backup system.