A. when a table is dropped and stored in the Recycle Bin
B. when all the control files are deleted
C. when a member of a multiplexed redo log group is dropped
D. when you are required to recover a table to its previous state

A. All the datafiles should be listed in the CREATE CONTROLFILE statement.
B. The DATA2.dbf and DATA3.dbf datafiles should be listed in the CREATE CONTROLFILE statement. 
C. The SYSTEM01.dbf datafile should be listed in the CREATE CONTROLFILE statement.
D. The SYSAUX01.dbf datafile should be listed in the CREATE CONTROLFILE statement.