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 . Prevents interruption of backup operations after a system reboot
B . Enables LUN Masking, assisting in performance
C . Provides access to devices during an outage
D . Provides high availability

Answer: A