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