The ORACLE_SID environment variable is set to +ASM. ASMLIB is not used in the configuration. You executed the following command to startup the Automatic Storage Management (ASM) instance. SQL> STARTUP; Which two activities are performed during a successful start up operation?（）

• A、The databases configured to use the ASM instance are mounted
• B、The disk groups are mounted as per the ASM_DISKGROUPS initialization parameter
• C、ASM starts the Oracle Cluster Synchronization Services (CSS) daemon if it is not started
• D、ASM discovers and examines the contents of all files that are in the paths specified in the ASM_DISKGROUPS initialization parameters