A system administrator created a /etc/exports file on server "Alpha" and entered a filesystem to be exported to server "Bravo." However， the remote servers are unable to mount the filesystems. What does the system administrator need to do？（）

A.Use the exportfs command on server "Alpha" to export the filesystem
B.Use the showmount command on server "Bravo" to import the filesystem
C.Use the startsrc command on server "Bravo" to refresh the NFS daemons
D.Use the chfs command on server "Alpha" to change the filesystem type to NFS