The‘lsvg－o’commandisrunwithanoutputofonlyrootvg,buttheserverhasanothervolumegroupnameddatavg,whichisnotdisplayed.Whatisthelikelycause?()

A.datavgisinanofflinestate.

B.‘lsvg-o’onlydisplaystherootvolumegroup.

C.‘lsvg-o’onlydisplaysthefistvolumegroup.

D.datavghasnofilesystemsandtherefore，isinactive.