Which two statements are true about the UNDROP clause of the ALTER DISKGROUP statement? (Choose two.)
A.
It cancels pending drops of disks dropped using the DROP DISKGROUP command.
B.
ASM disks can never be undropped as a result of a DROP DISKGROUP.
C.
It automatically unmounts the disks after successfully undropping them.
D.
Disks must be rebalanced manually after successfully undropping them.
E.
It is not possible to cancel pending drops of disks dropped using the force option.
Explanation:
https://oracle-base.com/articles/10g/automatic-storage-management-10g
B,E