What are the advantages of variable extent size support for large ASM files?（）

• A、It improves resync operations when the disk comes online after being taken offline for maintenance purposes. 
• B、It improves performance in the extended cluster configuration by reading from a local copy of an extent. 
• C、Fewer extent pointers are needed to describe the file and less memory is required to manage the extent maps in the shared pool.
• D、This feature enables faster file opens because of the reduction in the amount of memory that is required to store file extents.