A、Export the desired filesystem in the /etc/nfs file, run 'exportfs -a', create a mount directory on the desired server, and mount the NFS filesystem. B、Run 'exportfs -a', export the desired filesystem in the /etc/nfs file, create a mount directory on the desired server, and mount the NFS filesystem. C、Export the desired filesystem in the /etc/exports file, run 'exportfs -a', create a mount directory on the desired server, and mount the NFS filesystem. D、Run 'exportfs -u', export the desired filesystem in the /etc/exports file, create a mount directory on the desired server, and mount the NFS filesystem.