What filesystem does /dev/sde1 most likely use?

Consider the following output from df -i: Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/md0 1966080 45044 1921036 3% / none 125731 712 125019 1% /dev none 127729 1
127728 1% /dev/shm none 127729 17 127712 1% /var/run none 127729 2 127727 1%
/var/lock none 1966080 45044 1921036 3% /var/lib/ureadahead/debugfs /dev/sde1 0 0 0 –
/mnt What filesystem does /dev/sde1 most likely use?

A.
xfs

B.
reiserfs