多选题Which three features are provided by Recovery Manager and NOT provided by user-managed backup and recovery？（）AOnline backups.BSkipping unused block.CPartial database backups.DIncremental block-level backup.EDetection of corrupted blocks during backup.
题目
多选题
Which three features are provided by Recovery Manager and NOT provided by user-managed backup and recovery？（）
A
Online backups.
B
Skipping unused block.
C
Partial database backups.
D
Incremental block-level backup.
E
Detection of corrupted blocks during backup.