This seems to be a tricky question, not sure what EMC expects here - according to Cloud Tier Implementation guide:
-- p. 8 "The NFS, CIFS, and DD Boost protocols are supported for data movement to and from the cloud tier"
-- but when Retention Lock is used (p. 11) "Secure HTTP (HTTPS) is used for the transfer of data between a PowerProtect DD appliance and the cloud"
A is correct based on this statement in Cloud Tier Implementation manual.
The NFS, CIFS, and DD Boost protocols are supported for data movement to and from the cloud tier.
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