（单选题）
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
正确答案
答案解析
略
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