Given the following output from $/$etc$/$fstab$,$ which filesystems will be automatically checked on boot by the fsck command? $/$dev$/$sda$1/$boot ext$4$ defaults $11/$dev$/$sda$2$ swap swap defaults $10/$dev$/$sda$3/$ ext$4$ defaults $01/$dev$/$sda$4/$var ext$4$ defaults $10/$dev$/$sda$1/$home ext$4$ defaults $01/$dev$/$sr$0/$media$/$dvd iso$9660$ noauto,ro $00$ a$.$ none, as fsck must be run manually for each filesystem b$./,$ swap, and $/$var c$./,/$boot$,$ and $/$home d$.$ all of them, as fsck is run automatically at boot for all filesystems