Which statement is true about btrfs file system devices?
A. You must execute the btrfs device scan after every reboot to add a device to a btrfs file system.
B. The btrfs device scan -all-devices command scans physical devices looking for members of a btrfs volume.
C. Blocks are automatically rebalanced across all existing devices after adding new devices.
D. A device may be added to btrfs only if the file system is unmounted.
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