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Which two statements correctly describe the relation between a data file and the logical database
structures? (Choose two.)
A.An extent cannot spread across data files.
B.A segment cannot spread across data files.
C.A data file can belong to only one tablespace.
D.A data file can have only one segment created in it.
E.A data block can spread across multiple data files as it can consist of multiple operating system (OS)

Extent 不能跨数据文件，segment 可以，A 错，B 对
每个表空间都可以有一个或多个数据文件，但一个数据文件只能属于一个表空间，c 对
一个数据文件可以有多个段，并且段能跨数据文件，D 错
数据块不能跨数据文件，E 错

可以跨数据文件：segment
不可以跨数据文件：block、extent