What is data shredding?

A.
A process that tracks and manages object references on the Centera and deletes BLOBs no longer referenced by a CDF

B.
A process that manually manages object references and deletes BLOBs that are no longer referenced by a CDF

C.
A method to delete an object on the Centera ten times to ensure that it is completely deleted

D.
Deleted object is overwritten several times with different bit patterns