At which point is the Dell EMC Unity FAST Cache capacity reclaimed when a FAST Cache shrink operation is performed?

At which point is the Dell EMC Unity FAST Cache capacity reclaimed when a FAST Cache shrink operation is performed?
A . When the shrink operation is started
B . After all FAST Cache drives are deleted
C . After all dirty pages are cleaned within a set of drives
D . After the contents of FAST Cache are written to memory

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Answer: A