When using VTL on an EMC Data Domain system, why should persistent binding be enabled on the host?

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When using VTL on an EMC Data Domain system, why should persistent binding be enabled on the host?
A . Enables LUN Masking, assisting in performance
B . Provides access to devices during an outage
C . Provides high availability
D . Prevents interruption of backup operations after a system reboot

Answer: D