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Which industry standard informs the storage system that a specific block of allocated capacity is no longer needed or valid?
Correct Answer: D
Explanation/Reference: Explanation: UNMAP is a SCSI primitive that allows VMFS to communicate to the storage target that certain blocks are no longer used on a LUN backing a datastore. Using the UNMAP command, vSphere can issue a command tothe storage array to deallocate blocks of storage freed by vSphere, for example from a deletion of a VM, and return it to the storage array's resource pool without the involvement of a storage administrator. References: