Which three statements are true for Volume Copy?

Which three statements are true for Volume Copy?

A.
Volume Copy is a file-by-file copy.

B.
Source and target volume can have different QoS.

C.
To protect product volume performance, Volume Copy is recommended.

D.
Volume Copy is used for off-Host backup due to lower contention at source volume.

E.
License by capacity (TB) is required for Volume Copy.