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單項(xiàng)選擇題

Which of the following options describes Segment Shrink?()  

A. Reclaims space above and below the high-water mark without using additional space
B. Moves rows to a new physical location,resetting the high-water mark,but uses additional space during the operation
C. Deallocates space above the high-water mark that is currently not in use
D. None of the above

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