You are managing an Oracle Database 11g instance and an Oracle Database 10g instance on the same machine. Both instances use the ASM instance as storage. Which statement regarding the ASM disk group compatibility attributes are true in this scenario？（）

• A、 The database-compatibility version settings for each instance must be greater than or equal to the RDBMS compatibility of all ASM disk groups used by that database instances.
• B、 RDBMS compatibility and the database version determines whether a database instance can mount the ASM disk group.
• C、 The RDBMS compatibility settings for a disk group control the format of data structures for ASM metadata on the disk.
• D、 ASM compatibility controls which features for the ASM will be enabled.