You are managing an Oracle Database 11g ASM instance having three disks in a disk group with ASM compatibility attribute set to 11.1.0 and redundancy set to high. One of the disks in the disk group becomes unavailable because of power failure.  Which statements will be true in this scenario？（）

• A、 The disk is immediately dropped from the disk group.
• B、 The ASM tracks the extents that are modified during the outa
• C、 The ASM migrates the extents from the unavailable disk to the remaining disks.
• D、 The disk automatically goes offline.