What is the correct syntax to put a DATA1 disk offline for a failure group FG1, and drop it after five
minutes?
A.
 ALTER DISKGROUP data OFFLINE DISK DATA1IN FAILGROUP FG2 DROP AFTER 5m;
B.
 It is not possible to drop it after five minutes.
C.
 It is not possible to specify a disk In a FAILGROUP.
D.
 ALTER DISKGROUP data OFFLINE DISKS IN FAILGROUP FG2 DROP AFTER 5m;
E.
 ALTER DISKGROUPdata OFFLINE DISK DATAI IN FAILGROUP FG2 DROP AFTER 5 minutes;
A seems to be correct.
C is correct. You can specify either DISK or FAILGROUP
C
https://docs.oracle.com/database/121/SQLRF/statements_1009.htm#BABEJJID
C
A
Typo : C
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I think D
http://m.blog.csdn.net/jgmydsai/article/details/37650647
Sorry the correct is C