单选题Note the following structures in your database server： 1.Extents 2.OS Blocks 3.Tablespace 4.Segments 5.Oracle Data Block Which option has the correct arrangement of these structures from the smallest to the largest（）A2，5，1，4，3B1，2，3，4，5C5，2，1，3，4D2，1，5，4，3
单选题
Note the following structures in your database server： 1.Extents 2.OS Blocks 3.Tablespace 4.Segments 5.Oracle Data Block Which option has the correct arrangement of these structures from the smallest to the largest（）
A
2，5，1，4，3
B
1，2，3，4，5
C
5，2，1，3，4
D
2，1，5，4，3
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