The data on datavg is inaccessible. Using "df" the user discovers that none of the datavg filesystems are mounted. Running "lsvg" shows only rootvg. Running "importvg -y" gives the following error: "056-056 volume cannot be varied on because pv is marked missing". Which of the following steps should be performed?（）

• A、Run cfgmgr. 
• B、Run synclvodm. 
• C、Look in errorlog for hardware problems. 
• D、Boot into service mode and run fsck on filesystems.