What is the preferred method for reclaiming unused storage in a DMS table space?

A.
Perform an ALTER TABLESPACE…REDUCE operation.
B.
Perform a REORG on each table within the table space, then perform an ALTER
TABLESPACE…REDUCE operation.
C.
Perform an ALTER TABLESPACE…LOWER HIGH WATER MARK operation, and then an
ALTER TABLESPACE…REDUCE operation.
D.
Perform a REORG on each table within the table space, then perform an ALTER
TABLESPACE…LOWER HIGH WATER MARK operation.
Explanation: