单项选择题

Which of the following is a valid way of putting a tablespace named DAVE_TBS into hot backup mode?()

A.alter tablespace DAVE_TBS backup mode
B.alter tablespace DAVE_TBS start backup 
C.alter tablespace DAVE_TBS begin backup 
D.alter tablespace DAVE_TBS backup begin 
E.alter tablespace DAVE_TBS backup

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