What are the characteristics of RAID Extents on a Dell EMC Unity system?

What are the characteristics of RAID Extents on a Dell EMC Unity system?
A . RAID extents contain at least two drive extents from the same drive.RAID extents always include drive extents from two different Drive Partnership Groups.
B . Number of drive extents within a RAID extent is determined by the drive capacity.RAID extents will not include drive extents from two different Drive Partnership Groups.
C . No RAID extents contain two drive extents from the same drive.RAID extents will not include drive extents from two different Drive Partnership Groups.
D . No extents contain two drive extents from the same drive.RAID extents are always 256 MB in size.

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Answer: D