Joon is setting up a Network File System $($NFS$)$ share of the $/$backups$/$ directory with the system's Internet Protocol $($IP$)$ address and subnet mask. The share is read$-$write, with the reads and writes done synchronously. What command does he enter to express this?

$/$backups $192\mathrm{.}168\mathrm{.}0\mathrm{.}0/255\mathrm{.}255\mathrm{.}255\mathrm{.}0($rw$,$sync$)$

$/$backups$/192\mathrm{.}168\mathrm{.}0\mathrm{.}0/255\mathrm{.}255\mathrm{.}255\mathrm{.}0$ rw;sync

backups$/$gss$/192\mathrm{.}168\mathrm{.}0\mathrm{.}0/255\mathrm{.}255\mathrm{.}255\mathrm{.}0$rw$,$sync

dir$/$backups $192\mathrm{.}168\mathrm{.}0\mathrm{.}0/255\mathrm{.}255\mathrm{.}255\mathrm{.}0($rw$,$sync$)$