Which is true of the SnapVault backup of a NetApp storage system?

A.
The file is the basic unit for SnapVault backup destination.

B.
The qtree is the basic unit for SnapVault backup destination.

C.
The volume is the basic unit of SnapVault backup destination.

D.
The directory is the basic unit for SnapVault backup destination.

Explanation:
https://library.netapp.com/ecmdocs/ECMP1196991/html/GUID-06C70D3B-9A06-4D20-B140-EB147B941BDA.html

The data structures that are backed up and restored through SnapVault depend on the primary
system.
On systems running Data ONTAP, the qtree is the basic unit of SnapVault backup and restore.
SnapVault backs up specified qtrees on the primary system to associated qtrees on the
SnapVaultsecondary system. If necessary, data is restored from the secondary qtrees back to
their associated primaryqtrees.
On open systems storage platforms, the directory is the basic unit of SnapVault backup.
SnapVault backs upspecified directories from the native system to specified qtrees in the
SnapVault secondary system.
If necessary SnapVault can restore an entire directory or a specified file to the open systems
platform.
The destination system uses a slightly more disk space and directories than the source system.