Balanoglossus is a saprozoic hemichordate which lives in shallow coastal waters inside U shaped burrows. Given below are certain features of this tongue worm 

I. It has a cylindrical body which is ciliated for most of the part

II. Body is divisible into a mouth, collar and trunk

III. The trunk is differentiated into branchiogenital, hepatic and abdominal regions

IV. They posses cells called vanadocytes

V. They obtain food from swallowed mud

Which of the above are correct ?