What is the recommended procedure to shut down an ASM instance with a mounted ACFS file system at …?

What is the recommended procedure to shut down an ASM instance with a mounted ACFS file
system at /u01/app/oracle/acfsmounts/vol1, where the volume name is VOL1 and the disk group
name is DATA?

A.
Issue the synchronize command for the file system twice. Then stop the ASM Instance with the
SQL*Plus SHUTDOWN ABORT command.

B.
Use the advmutil dismount /all /DATA command. Then stop the ASM instance with the
SQL*Plus SHUTDOWN IMMEDIATE command.

C.
Use the /bin/umount /u01/app/oracle/acfsmounts/vol1 command. Then shut down the ASM
instance with the SQL*PIus SHUTDOWN IMMEDIATE command.

D.
Use the SQL ALTER DISKGROUP VOLULE VOL1 DISMOUNT command. Then stop the ASM
instance with the SQL*Plus SHUTDOWN IMMEDIATE command.

E.
Stop the ASM instance with the SQL*Plus SHUTDOWN IMMEDIATE command.

Explanation:
Oracle ACFS and Dismount or Shutdown Operations
It is important to dismount any active file system configured with an Oracle ADVM volume device
file before an Oracle ASM instance is shutdown or a disk group is dismounted. After the file
systems are dismounted, all open references to Oracle ASM files are removed and associated
disk groups can be dismounted or the instance shut down.
Oracle Automatic Storage Management Administrator’s Guide
11g Release 2 (11.2)