ASystempadministratorwantstoNFSmountafilesystemfromserveralphatoserverbravo.Whichofthefollowingcommandsshouldbeissuedfrombravotodeterminewhichfilesystemsarebeingexportedbyserveralpha（）
A.lsexportalpha
B.showmount-ealpha
C.exportfs-lalpha
D.mount-enfsalpha
参考答案：B
