What is the image removal behavior for relocated images from a Disk Staging Storage Unit when the high water mark is reached during a backup?

A.
Symantec NetBackup waits for the backup to complete before removing the oldest images until the low water mark is reached.

B.
Symantec NetBackup waits for the backup to complete before removing images with the lowest rank data classification until the low water mark is reached.

C.
Symantec NetBackup removes the oldest images until the low water mark is reached.

D.
Symantec NetBackup removes images with the lowest rank data classification until the low water mark is reached.