单项选择题

A.dfB.showmountC.exportfsD.refresh -g nfsAn administrat……

An administrator has received complaints from users that an application is not available while other applications run. This application resides on an NFS mounted filesystem.
Which of the following commands should be run as a reasonable first step to handle this problem（）

A.df
B.showmount
C.exportfs
D.refresh -g nfs

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