（单选题）
Which statement is true regarding online redefinition for the migration of BasicFile LOBs to SecureFile LOBs？（）
A It cannot be done in parallel.
B It can be done at the table level or partition level.
C It does not require additional storage because the operation is done online.
D Local and global indexes are maintained automatically during the operation.
正确答案
答案解析
略
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