【单项选择题】
Given below is a list of scenarios： <br /> 1）A user terminates his session abnormally. <br /> 2）The connection between the server and the client application terminates because of a network failure. <br /> 3）A schema is accidentally dropped. <br /> 4）The tablespace is accidentally dropped from the database. <br /> 5）The hard disk gets corrupted and the data files in the disk are lost. <br /> 6）The database instance abnormally shuts down because of power failure. <br /> Which scenarios require DBA intervention to perform recovery（）<p> Given below is a list of scenarios： <br /> 1）A user term
A、A.4 and 5
B、B.1，3，and 6
C、C.4，5，and 6
D、D.3，4，and 5
E、E.1，2，and 6
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