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Whence options "noexec,nosuid" and other came?

~~~~:/media/Data$ grep home /etc/fstab /etc/mtab
/etc/fstab:/dev/sdb9                                  /home       ext4     noatime,nodiratime,commit=15  0  2
/etc/mtab:/dev/sdb9 /home ext4 rw,noatime,nodiratime,commit=15 0 0
~~~~:/media/Data$ grep Data /etc/fstab /etc/mtab
/etc/fstab:/dev/disk/by-label/Data               /media/Data   reiserfs    noatime,nodiratime,users  0  1
/etc/mtab:/dev/sdb5 /media/Data reiserfs rw,noexec,nosuid,nodev,noatime,nodiratime 0 0
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